统计与概率
数据分析、概率分布、假设检验与统计方法。
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as of 2011, the following are the ages at which a countrys presidents w…
8
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multiple choice 4 points assume a normal distribution and use a hypothe…
There is insufficient evidence to conclude the burn time is not 5 seconds.
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multiple choice 4 points identify the type ii error. a waste management…
Concluding that the garbage collector picks up on average 4 tons of garbage per day when, in fact, he picks up more.
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which r-value represents the strongest negative correlation? -0.7 -0.22…
\(-0.7\)
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5 multiple choice 4 points select the most appropriate response. which …
\(H_1:\mu>k\)
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multiple choice 4 points select the most appropriate response. which ty…
\(H_1:\mu < k\)
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darius is studying the relationship between mathematics and art. he ask…
\(y = 1.518x+0.995\)
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determine the critical value. using the z - tables (or t - tables), det…
\(- 2.326\)
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multiple choice 4 points select the most appropriate response. it is cl…
There is not sufficient evidence to reject the claim \(\mu = 59.3\)
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melinda works at a cafe. each day that she works, she records x, the to…
\(\$26\)
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a variety of two types of snack packs are delivered to a store. the box…
The number of calories in the packs of trail mix have a greater variation than the number of calories in the packs of crackers.
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2.5. explain how sociologists use existing sources for research and ide…
Peter Stearns found that parents experienced increased empowerment over the 20th century as they were held responsible for protecting children from harm, and that children's perce…
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what does juliet mean when she says, \wherefore art thou romeo?\ she is…
She is disappointed about his name and family.
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ryan gathered data about the age of the different dogs in his neighborh…
It is a weak negative correlation, and it is not likely causal.
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state your conclusion to the hypothesis test. if a 95% confidence inter…
The null hypothesis would not be rejected.
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24 multiple choice 4 points select the most appropriate response. the l…
all of the above.
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23 multiple choice 4 points assume a normal distribution and use a hypo…
There is insufficient evidence to conclude the burn time is not 5 seconds.
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payton collected data to show the relationship between the number of ho…
-4.5
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multiple choice question which leadership model states that successful …
Path - goal leadership
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a national organization has been working with utilities throughout the …
At \(\alpha = 0.01\), there is not sufficient evidence to conclude the true mean wind speed at the site exceeds \(22\) mph.
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the graph and table shows the relationship between y, the number of wor…
3,000
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multiple choice 4 points 21 state your conclusion to the hypothesis tes…
There is sufficient sample evidence for the program's claim to be considered correct.
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a stats class was interested in determining the percentage of students …
\(758\)
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the number of times a player has golfed in ones lifetime is compared to…
It is a weak negative correlation, and it is not likely causal.
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assume a normal distribution and use a hypothesis test to test the give…
Do not reject the null hypothesis. There is not sufficient evidence that the mean age is less than 26 years.
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a cell phone company wants to determine the average amount of data that…
one thousand of their customers with a current smartphone data plan
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10. movie film is contained on a circular reel. the table shows approxi…
The regression equation is \(y = 5.31x-28.905\). A film with a diameter of \(15\) inches would run for approximately \(50.75\) minutes.
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use the p - value method to conduct the hypothesis test. a waste manage…
Reject $H_0$ because the p - value is less than $0.05$.
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identify the type ii error. a waste management service attempts to desi…
Concluding that the garbage collector picks up on average 4 tons of garbage per day when, in fact, he does.
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teddy is preparing to sell some wooden blocks at a garage sale. before …
20
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identify the correct null and alternative hypotheses. a waste managemen…
\(H_0:\mu = 4\) vs. \(H_a:\mu>4\)
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identify the type i error. a state university annual report showed that…
The university concludes that retention is increasing, but in fact it has not.
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identify the correct alternative hypothesis. a state university annual …
\(H_a:p > 0.24\)
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which relationships would most likely be causal? select two options. □ …
a positive correlation between the number of homework assignments completed and the grade on the exam, a negative correlation between the time a glass of ice water sits on the cou…
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multiple choice 4 points state your conclusion to the hypothesis test. …
Do not reject the null hypothesis. There is insufficient evidence to conclude that fewer than 15% of residents use public transportation.
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which sample fairly represents the population? select two options. usin…
- Sending a mandatory and confidential e - mail survey to every tenth employee of a company to determine overall job satisfaction. - Taking a poll in the main hallway between clas…
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multiple choice 4 points select the most appropriate response. five yea…
\(H_A:p > 0.08\); \(z = 4.66\); Reject the null hypothesis. This data shows a proportion in car commuting greater than 8%.
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the students in marys math class recorded the dimensions of their bedro…
The histogram is right - skewed, so the mean is greater than the median.
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calculate the p - value. an airline claims that the no - show rate for …
0.1499
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calculate the test statistic. a research company claims that no more th…
2.07
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identify the correct null and alternative hypotheses. a hypnosis progra…
\(H_0: p = 0.57\) vs. \(H_a: p<0.57\)
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multiple choice 4 points select the most appropriate response. what typ…
Type I error
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multiple choice 4 points true or false. if the p - value is less than a…
True
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select the most appropriate response. which type of alternative hypothe…
\(H_1:\mu < k\)
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the graph shows the ages of different concertgoers who have back - stag…
The two holders of back - stage passes whose ages are above 40 make the mean age higher than the median age.
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multiple choice 4 points determine the critical value. using the z - ta…
- 2.326
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7) the daily intakes of milk (in ounces) for ten randomly selected peop…
A. \(3.78\space oz<\sigma<13.95\space oz\)
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multiple choice 4 points select the most appropriate response. 3 in hyp…
It is the point on the number line where the decision changes from reject to fail to reject.
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which meaning of the word resignation most closely matches its meaning …
For the first question: B. noun | acceptance of something undesirable or inevitable For the second question: A. W W Jacobs
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the table shows the time a patient spends at the dentist and the amount…
0.93
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multiple choice 4 points select the most appropriate response. it is cl…
There is sufficient evidence to support the claim $\mu = 59.3$
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1 multiple choice 4 points select the most appropriate response. it is …
There is sufficient evidence to reject the claim \(\mu = 50.2\).
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raquel and van live in two different cities. as part of a project, they…
Raquel's data are most likely closer to $3.42 than Van's data are to $3.78.
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3. each major league baseball (mlb) team is allowed to have 26 players …
- a. Assign numbers 1 - 780, use random number generator for 100 distinct numbers, select corresponding players. - b. Stratify by teams, calculate proportion \(\frac{3}{26}\) per …
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what does \issimo\ mean in italian? not at all very soulja boy
Very
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it is recommended that adults get 8 hours of sleep each night. a resear…
A. The distribution of sample means will be normal even if the distribution of the data in the population is not normal
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it is recommended that adults get 8 hours of sleep each night. a resear…
C. \(H_0:\mu_x = 8\) hours per night
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it is recommended that adults get 8 hours of sleep each night. a resear…
C. The p - value must have been greater than 0.05.
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a medical study was investigating whether getting a flu shot actually r…
E. A one - tailed test will be performed since the alternative hypothesis states that the parameter is less than the hypothesized value.
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fill in the blank rejecting the null hypothesis when the null hypothesi…
a Type I Error
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fill in the blank. a p - value is the probability ____________. choose …
B. A p - value is the probability of observing the actual result, a sample mean, for example, or something more unusual just by chance if the null hypothesis is true.
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there are 8 sophomores on the academic team. at the last competition, t…
79%
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in a study of 825 randomly selected medical malpractice lawsuits, it wa…
- Hypothesis test: F. \(H_0:p = 0.5\), \(H_1:p>0.5\) - Test statistic: \(z = 5.95\) - P - value: \(0.000\) - Conclusion about the null hypothesis: A. Reject the null hypothesis be…
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suppose that in a random selection of 100 colored candies, 21% of them …
- Hypotheses: D. \(H_0:p = 0.27\), \(H_1:p eq0.27\) - Test statistic: \(-1.35\) - P - value: \(0.177\) - Conclusion: A. Fail to reject \(H_0\). There is not sufficient evidence t…
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identify the type i error and the type ii error that corresponds to the…
- **Type I error**: B. Reject the claim that the proportion of people who write with their left hand is 0.19 when the proportion is actually 0.19 - **Type II error**: B. Fail to r…
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when is a t - test performed instead of a z - test? choose the correct …
B. When the population standard deviation is not known
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a relief sculpture is a. a three - dimensional form of art that is mean…
C. a type of sculpture that contains objects embedded in a ground surface.
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sal recorded the number of crackers in each snack - sized package he op…
The data is skewed, and the lowest number of crackers in a package was \(7\).
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dora likes to explore. recently, she explored southeast australia where…
A. 14
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dora likes to explore. recently, she explored southeast australia where…
D. There is sufficient evidence to indicate that the average height of all Mountain Ash trees in southeast Australia is more than 250 feet.
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ryan called each school in the district to determine whether or not the…
Ryan conducted a survey where he asked about qualitative data.
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dynamic markings... apply for exactly one measure. apply indefinitely, …
medium
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i had assumed that my talent - show fiasco meant i never had to play th…
character vs. character
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the histogram shows the duration, in minutes, of movies in theaters. wh…
The median is less than the mean.
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dora likes to explore. recently, she explored southeast australia where…
D. There is sufficient evidence to indicate that the average height of all Mountain Ash trees in southeast Australia is more than 250 feet
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which relationships could have a negative correlation? select three opt…
number of hours worked and free time, the speed of a train and the length of time to reach the destination, a tadpole’s age and the length of its tail
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which is most likely the correlation coefficient for the set of data sh…
\(0.872\)
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multiple choice. choose the one alternative that best completes the sta…
1) A. 37.156 2) B. 0.115 3) C. \(0.36\ oz<\sigma<0.67\ oz\) 4) C. \(1.9\ yr<\sigma<4.5\ yr\) 5) C. \(16.9<\sigma<29.3\) 6) A. \(0.21\ oz<\sigma<0.82\ oz\)
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dora likes to explore. recently, she explored southeast australia where…
A. With a p - value less than \(0.0001\), there is sufficient evidence to reject the null hypothesis and accept the alternative as true.
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priya is playing a game where she earns online badges for scoring highe…
215
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dora likes to explore. recently, she explored southeast australia where…
C. \(H_A:\mu_x > 250\)
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dora likes to explore. recently, she explored southeast australia where…
B. $H_0$: The average height of all Mountain Ash trees in southeast Australia is 250 feet, the same as the average height of typical old growth Douglas Fir.
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the box plot compares martas and anis diving scores in the first severa…
Ani was more successful because she had the greater measure of center.
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the radius and circumference of several objects were measured. which be…
It is a strong positive correlation, and it is likely causal.
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allison randomly sampled 40 students in a particular class and asked ea…
D. Of all the random samples of 40 students from this class, 0.03% would give a sample mean of 9.5 hours per week or more given that the true mean number of hours spent studying f…
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is the nutritional information listed on food items accurate? researche…
A. The distribution of sample means will be normal only if the population data (that is, calorie content of all frozen dinners of this type produced during this particular period)…
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cameron wondered if the average score on a final exam was different bet…
D. Cameron did not have evidence that there was a difference in the average scores on the final exam between those who texted during lecture and those who did not text during lect…
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researchers wondered if the average water temperature of streams withou…
A. Researchers found evidence that the average water temperature of streams without tailed frogs was different than the average water temperature of streams with tailed frogs when…
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assume that a simple random sample has been selected from a normally di…
B. There is strong evidence that the mean is less than 1000 hic, but one of the booster seats has a measurement that is greater than 1000 hic.
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suppose were told 1 widgets is equal to 3.1 dingbats, next, determine t…
\(\frac{1\ \text{widgets}}{3.1\ \text{dingbats}}\)
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which r - value represents the strongest negative correlation? - 0.7 - …
\(-0.7\)
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assume that a simple random sample has been selected from a normally di…
Reject \(H_{0}\). There is sufficient evidence to support the claim that the sample is from a population with a mean less than 1000 hic.
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assume that a simple random sample has been selected from a normally di…
The \(P\) - value is \(0.0125\)
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the table shows the time a patient spends at the dentist and the amount…
0.93
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which relationships would most likely be causal? select two options. □ …
a negative correlation between the temperature and the amount of snow still on the ground, a negative correlation between the number of digital photos uploaded to a website and th…
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which is most likely the correlation coefficient for the set of data sh…
\(-0.91\)
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read the text the trouble with sports history is that its always being …
Language like "trailblazing triumph" and "anything but ordinary" suggests that the author considers Bikila's success so exceptional that it stands out even among other famous vict…
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assume that a simple random sample has been selected from a normally di…
\(t=-3.34\)
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which is most likely the correlation coefficient for the set of data sh…
\(0.19\)
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assume that a simple random sample has been selected from a normally di…
The test statistic $t\approx - 3.33$