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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question 12 (1 point) listen what does margin mean? 1) the change in th…
3) The amount of cash that the investor must have in her account in order to buy on margin.
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jeff and his friends are playing a game with an ordinary die. the faces…
A. \(\$0.67\)
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a construction company has the opportunity to place a bid on two differ…
B. The construction company should place a bid on project G because the expected value of project G is greater than the expected value of project H.
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the test to detect the presence of respiratory syncytial virus is 97% a…
C. \(0.02\%\)
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directions: select the correct answer from each drop - down menu. a gam…
The expected value for one spin is \(\$11.6\). This is a **profitable** game because the expected value is **greater than** zero.
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kate is taking a short break and wants to pick up lunch from her favori…
A. Beachside Square
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a group of doctors are promoting annual cancer screenings. the doctors …
# Explanation: ## Step1: Calculate the expected value of participating in screening The cost of screening is \(C_{screening}=\$1486\). The probability of having cancer \(p = 0.1\)…
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3. what does it mean to have a “run on the bank”? it is when a bank ove…
It is when all of the depositors attempt to take their money out of the bank at the same time.
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jimmy is playing a game at a state fair, where he is throwing a dart at…
A. rectangular
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richard is purchasing car insurance. he has two options: a high deducti…
A. The high deductible policy is the most cost efficient because the expected value of the high deductible policy is less than the expected value of the low deductible policy, the…
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hal is playing a game with a spinner. the spinner is equally divided in…
D. A random variable, \(X\), can be defined for the given spinner by assigning a numerical value to each region of the spinner.
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which of the following statements best describe sample space? a. the se…
A. The set of all possible outcomes of an experiment.
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a research agency conducted a survey of 2,300 families, asking them how…
C. 0.29
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jacob is playing a game where he is tossing four dice. the table below …
B. 2
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1 true or false 1 point true/false: communication methods do not play a…
1. B. False 2. C. An issue that transcends national boundaries and affects multiple countries or regions 3. B. False 4. B. False
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question 9 of 10 when gathering information about an industry, pay atte…
An industry that is growing and adding jobs which means it may be easier to get work.
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read the excerpt from the time travelers guide to elizabethan england. …
During the Elizabethan period, food was often scarce.
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7th grade revise and edit practice worksheet part 1: sentence correctio…
1. The teacher asked if anyone had brought their homework. 2. My friends and I go to the mall every weekend. 3. It's important to finish your work before you play games. 4. The do…
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5. which of the following could be a good way to show the data the stud…
B. A bar graph showing shadow lengths at different times of day
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the number of newly reported crime cases in a county in new york state …
Regression Equation: \(y = 37.03x+1123.77\) Final Answer: \(1457\)
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map of china which of these could be an accurate explanation as to the …
B. The more densely populated areas are along the coast
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address to the troops at tilbury in the mean time my lieutenant - gener…
A. Both use an appeal to logos by providing a reason to support her purpose.
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27. which error occurs when the null hypothesis is incorrectly rejected…
C. Type I error
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26. what does the mean represent in a data set? a. the difference betwe…
C. The average value of all data points
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25. what does failing to reject the null hypothesis imply? a. the null …
d. There isn't sufficient evidence to support the alternative hypothesis
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construct a 95% confidence interval for the population mean, μ. assume …
C. \((77.29,85.71)\)
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provided below are summary statistics for independent simple random sam…
\(P = 0.0198\)
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24. if a surveys sample does not accurately represent the broader popul…
d. Sampling Error
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find the critical value, ( t_{c} ) for ( c = 0.99 ) and ( n = 10 ). a. …
D. 3.250
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23. in data analysis, identifying patterns and trends is essential for:…
C. Drawing meaningful conclusions
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a random sample of 15 statistics textbooks has a mean price of $105 wit…
C. Cannot use normal distribution or t - distribution
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2. the table at the right shows the life expectancy and annual per capi…
c. The regression equation predicts a life expectancy of approximately \(72.42\) d. The difference from the actual value (\(77\)) is \(4.58\) e. Above the regression line. A stron…
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22. which of the following best describes a p - value? a. the probabili…
a. The probability of observing the data, or something more extreme, if the null hypothesis were true.
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21. what mathematical operation do you often perform to analyze trends …
b. Subtraction
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a random sample of 56 fluorescent light bulbs has a mean life of 645 ho…
D. \( (636.9,653.1) \)
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20. when calculating the average score from a set of data, which formul…
D. (Sum of values) / (Number of values)
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provided below are summary statistics for independent simple random sam…
C. \(H_0:\mu_1 = \mu_2\), \(H_a:\mu_1 eq\mu_2\)
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19. what does a positive correlation between two variables indicate? a.…
B. As one variable increases, the other also increases
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a random sample of 10 parking meters in a beach community showed the fo…
A. ($3.39,$6.01)
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shown below is the confidence interval (cl) for the difference, μ₁ - μ₂…
C. It can be said, with 90% confidence, that the value of \(\mu_1\) is somewhere between 30 less and 15 greater than the value of \(\mu_2\). Note that this means the difference be…
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score on last try: 0 of 1 pts. see details for more. > next question yo…
\(0.309\)
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which of the following root words means \man\? gram hum grad hab
hum
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18. which statistical tool is used for analyzing and visualizing data? …
d. Statistical software
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find the critical values, ( x_{r}^{2} ) and ( x_{l}^{2} ), for ( c = 0.…
C. \(2.558\) and \(23.209\)
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17. what does a low p - value (typically less than 0.05) indicate in hy…
B. The observed data are unlikely under the null hypothesis
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provided below are summary statistics for independent simple random sam…
The 95% confidence interval is from \(-4.672\) to \(-1.328\)
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the grade point average collected from a random sample of 150 students …
A. \((2.71,3.01)\)
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16. what does calculating the range of a data set help you understand? …
B. The spread between the highest and lowest values
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provided below are summary statistics for independent simple random sam…
Since the test statistic is in the rejection region, reject \(H_0\).
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construct a 99% confidence interval for the population mean, μ. assume …
A. \((19.9,24.9)\)
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15 which measure of central tendency is most affected by outliers? a. m…
d. Mean
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provided below are summary statistics for independent simple random sam…
\(\pm2.056\)
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find the critical value ( z_c ) that corresponds to a 99% confidence le…
C. \(\pm2.575\)
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14. for which of the following research objectives would a pie chart be…
A. Showing the composition of a whole
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provided below are summary statistics for independent simple random sam…
\(t\approx - 3.69\)
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uses objective j 1. jennifer and barry run an ice cream shop. they gath…
a. Plot the points \((84,1520),(81,1375),(87,1974),(79,920),(77,870),(74,643),(81,1497)\) on the given graph. b. \(y = 107.7x-7333.7\) c. The slope is \(107.7\). It means that for…
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13. which statistical test is appropriate for comparing the means of tw…
A. Independent samples t - test
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the dotplot shows the weights (in pounds) of 15 dogs selected randomly …
D. \((2.89,16.91)\)
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11. if a studys p - value is 0.03, and the significance level is set at…
B. Reject the null hypothesis.
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the grade point average collected from a random sample of 150 students.…
D. \(0.15\)
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10. what is the probability of drawing a red card from a standard deck …
B. \(1/2\)
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construct a 90% confidence interval for the population mean, μ. assume …
B. \((19.9,24.9)\)
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which of the following words has a suffix that means \state of or condi…
Tightness
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the suffix \-ness\ means \state of or condition.\ which word has a rela…
Rudeness
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the first step in new product planning is to develop a full marketing s…
1. B. False 2. A. True 3. B. False 4. A. True 5. A. True
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a private opinion poll is conducted for a politician to determine what …
D. 3,394
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which of the following words has a prefix that means ot\? uninterrupted…
Uninterrupted
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9. when is cluster sampling most useful? a. when the population is smal…
C. When the population is large and spread out over a wide area
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the suffix “-arium” means “place for.” which word has a related meaning…
Aquarium
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8. the mode of a data set is: a. the difference between the highest and…
d. The value that appears most frequently
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the suffix \-al\ means \characterized by or related to.\ which word has…
Personal
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the prefix \un-\ means ot.\ which word has a related meaning? nons top …
Unspeakable
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the prefix \under-\ means \too little or below.\ which word has a relat…
Undervalue
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when 455 college students were surveyed, 120 said they own their car. f…
B. \(0.264\)
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7. what does the null hypothesis (h₀) typically assert in hypothesis te…
C. There is no effect or difference.
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the prefix \un - \ means ot.\ which word has a related meaning? bifocal…
Unmoving
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the prefix \un - \ means ot.\ which word has a related meaning? deletei…
Unreadable
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6. which error occurs due to the chance variation in the sample selecte…
d. Sampling Error
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the prefix \oct-\ means \eight.\ which word has a related meaning? octa…
Octagon
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select the word in the sentence that means \to gather (a crop).\ seeing…
harvest
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4. what is the commonly used significance level (a) threshold in hypoth…
d. 0.05
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in a sample of 10 randomly selected women, it was found that their mean…
B. \((61.9,64.9)\)
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2 what is the main goal of designing a sampling plan? a. to use all typ…
d. To obtain a sample that accurately represents the population
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1. what statistical tool is commonly used for visualizing the distribut…
c. Bar chart
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select the word in the sentence that means \cry out suddenly, especiall…
exclaimed
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15. what does a type ii error signify in hypothesis testing? a. failing…
a. Failing to reject a false null hypothesis.
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14. what is the primary reason for setting a significance level before …
A. To decide the threshold for rejecting the null hypothesis.
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find the critical value, $t_{c}$, for $c = 0.90$ and $n = 15$. a. 2.624…
C. \(1.761\)
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13. what statistical method is used to find the middle value in a data …
A. Median
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12. if a studys p - value is 0.03, and the significance level is set at…
d. Reject the null hypothesis.
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find the value of e, the margin of error, for c = 0.95, n = 15 and s = …
A. 3.101
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11. what does analyzing data involve? a. using statistical methods to u…
A. Using statistical methods to understand the data
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select the word in the sentence that means \to seize and hold firmly.\ …
grasped
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10. critical evaluation of datas reliability and validity is important …
d. Ensuring the integrity of conclusions
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8. which of the following is a measure of dispersion? a. median b. rang…
B. Range
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in a random sample of 28 families, the average weekly food expense was …
B. Use the t - distribution.
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read the excerpt from \the role of social media in the arab uprising\ b…
The first passage provides more effective evidence because it has data and statistics from research reports, while the second passage uses titles of articles and authors' names as…
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select the word in the sentence that means \to think about and begin to…
addresses
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7. what is the commonly used significance level (a) threshold in hypoth…
d. 0.05
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in a random sample of 60 computers, the mean repair cost was $150 and a…
D. (\$142,\$158)