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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a variable y of a finite population has the frequency distribution show…
\(0.45\)
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a variable y of a finite population has the frequency distribution show…
| \(y\) | \(P(Y = y)\) | | ---- | ---- | | \(4\) | \(0.15\) | | \(5\) | \(0.15\) | | \(6\) | \(0.45\) | | \(7\) | \(0.25\) |
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c. is the gender of college students a discrete random variable, a cont…
B. It is a discrete random variable.
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determine whether the value is a discrete random variable, continuous r…
a. A. It is a discrete random variable. b. A. It is a continuous random variable. c. C. It is not a random variable. d. A. It is a continuous random variable. e. A. It is a contin…
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refer to the accompanying table, which describes the number of adults i…
\(1.5\)
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refer to the accompanying table, which describes results from groups of…
The standard deviation is $\sigma = 1.4$ girl(s).
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refer to the accompanying table, which describes results from groups of…
\(4.0\)
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a factory manager collected data on the number of equipment breakdowns …
a. $\mu_W = 0.35$, $\sigma_W\approx0.572$; b. $0.35$; c. $87.5$
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a factory manager collected data on the number of equipment breakdowns …
a. $\mu_W = 0.35$, $\sigma_W\approx0.572$ b. The mean $\mu_W$ represents the average number of breakdowns per day. So, on average, there are $0.35$ breakdowns per day.
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a factory manager collected data on the number of equipment breakdowns …
a. $\mu_{W}=0.35$ b. $\sigma_{W}\approx0.572$
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a factory manager collected data on the number of equipment breakdowns …
$\mu_W = 0.35$, $\sigma_W\approx0.572$
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3) choose the best answer. what does the word inevitable mean based on …
unavoidable
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a factory manager collected data on the number of equipment breakdowns …
$\mu_W = 0.35$, $\sigma_W\approx0.57$
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assessment 1. customers like having a chance to let off steam. ○ true ○…
1. True 2. True 3. False 4. False
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if you are dealt 3 cards from a shuffled deck of 52 cards, find the pro…
\(0.001086\)
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the random variable x is the crew size of a randomly selected shuttle m…
\(\sigma\approx1.462\)
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the random variable x is the crew size of a randomly selected shuttle m…
\(\mu = 5.624\). The correct interpretation is B. As the number of observations, \(n\), increases, the mean of the observations will approach the mean of the random variable.
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if you are dealt 3 cards from a shuffled deck of 52 cards, find the pro…
\(0.012941\)
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the random variable x is the crew size of a randomly selected shuttle m…
\(\mu = 5.624\). The mean of the random variable \(X\) (crew - size) is \(5.624\). This means that, on average, the crew size of a randomly selected shuttle mission is approximate…
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a city council consists of seven democrats and five republicans. if a c…
\(\frac{25}{66}\)
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college students are randomly selected and arranged in groups of three.…
A. Yes, the table shows a probability distribution. A. \(\mu = 1.6\) students
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a box contains 15 transistors, 5 of which are defective. if 5 are selec…
\(\frac{12}{143}\)
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a box contains 15 transistors, 5 of which are defective. if 5 are selec…
\(\frac{1}{3003}\)
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groups of adults are randomly selected and arranged in groups of three.…
A. \(\mu = 0.9\) adults(s) A. \(\sigma=0.7\) adults(s) A. Yes, the table shows a probability distribution.
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groups of adults are randomly selected and arranged in groups of three.…
A. \(\mu = 0.9\) adult(s)
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groups of adults are randomly selected and arranged in groups of three.…
A. Yes, the table shows a probability distribution.
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in one lottery, a player wins the jackpot by matching all five distinct…
\(\frac{1}{31765734}\)
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question: after entering data from a probability distribution into a ti…
D. $\overline{x}$
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six stand - up comics, a, b, c, d, e, and f, are to perform on a single…
\(\frac{1}{6}\)
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question: look at the table below. why is this table not a probability …
A. At least one of the individual probabilities (individual items in the second column) is less than 0 or greater than 1.
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at least one of the individual probabilities (individual items in the s…
For the first question (left - hand table): A. At least one of the individual probabilities (individual items in the second column) is less than 0 or greater than 1. For the secon…
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a researcher randomly selects and measures the volumes of the contents …
D. No, because \(0.024\) is contained in the confidence interval.
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tyrone, kim, maria, katrina, jim, eduardo, simone, and ian have all bee…
a. \(40320\) b. \(720\) c. \(\frac{1}{56}\)
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the prices of a random sample of 23 new motorcycles have a sample stand…
B. With 95% confidence, you can say that the population standard deviation is between \(\$2869\) and \(\$5251\).
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determine whether the following statement is true or false when working…
C. The statement is false because the denominators of the probability fractions consist of the total number of combinations
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the prices of a random sample of 23 new motorcycles have a sample stand…
\((2869,5251)\)
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determine whether the statement is true or false. if the statement is f…
A. The statement is true.
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those who chronically have difficulty dealing with others and establish…
T
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fill in the blanks so that the resulting statement is true. the probabi…
The first blank is \(1\), the second blank is combinations (or outcomes).
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the prices of a random sample of 23 new motorcycles have a sample stand…
D. With \(95\%\) confidence, you can say that the population variance is between \(8232853\) and \(27573365\).
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the prices of a random sample of 23 new motorcycles have a sample stand…
\((8233339,27573365)\)
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the following table displays a frequency distribution for the number of…
| \(X\) | \(P(X)\) | | ---- | ---- | | \(4\) | \(0.056\) | | \(5\) | \(0.069\) | | \(6\) | \(0.542\) | | \(7\) | \(0.278\) | | \(8\) | \(0.056\) |
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the following table displays a frequency distribution for the number of…
\(0.029\)
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the prices of a random sample of 23 new motorcycles have a sample stand…
\((8233333,27573333)\)
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evaluate each expression if $r = 12$, $s=-4$, and $t=-6$. 13 the distan…
The average difference between his income and expenses each month is \(-150\). This means that, on average, Mr. Engle's expenses exceeded his income by \(\$150\) each month last y…
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the following table displays a frequency distribution for the number of…
\(0.028\)
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evaluate each expression if ( r = 12 ), ( s = - 4 ), and ( t = - 6 ). 9…
\(-150\)
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a. what are the possible values of the random variable x? 4, 5, 6, 7, 8…
a. \(4,5,6,7,8\) b. \(X = 7\)
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latin roots terr, rupt, tract, aqua, dict some words in english have ro…
- **terr**: "terrain" (the physical features of an area of land) - **rupt**: "interrupt" (to stop the continuous progress of (an activity or process) by causing a disturbance or p…
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the waiting times (in minutes) of a random sample of 20 people at a ban…
A. With \(95\%\) confidence, you can say that the population standard deviation is between \(2.4\) and \(4.7\) minutes.
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fill in the blanks so that the resulting statement is true. the probabi…
The first blank is \(1\), and the second blank is combinations (or outcomes).
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the waiting times (in minutes) of a random sample of 20 people at a ban…
\((2.4,4.7)\)
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evaluate each expression if ( r = 12 ), ( s=-4 ), and ( t=-6 ). 9. ( r …
The value of the expression \(\frac{I - E}{12}\) is \(-150\). This means that, on average, Mr. Engle's expenses exceeded his income by \(\$150\) each month.
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fill in the blanks. six stand - up comics, a, b, c, d, e, and f, are to…
The probability that comic \(E\) will perform first is the number of \(\boldsymbol{5!}\) (permutations of the remaining \(5\) comics) with comic \(E\) performing first divided by …
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the waiting times (in minutes) of a random sample of 20 people at a ban…
B. With \(95\%\) confidence, you can say that the population variance is between \(5.9\) and \(21.8\).
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the waiting times (in minutes) of a random sample of 20 people at a ban…
\((5.9,21.8)\)
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the waiting times (in minutes) of a random sample of 20 people at a ban…
\(5.4\leq\sigma^{2}\leq25.5\)
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each expression if $r = 12$, $s = - 4$, and $t = - 6$, 10. $rs + 16$ 11…
The value of the expression is \(-150\). This means that, on average, Mr. Engle had a deficit of \(\$150\) each month (since his expenses were greater than his income).
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the table shows the distribution, by age and gender, of the 27.6 millio…
\(0.03\)
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the annual earnings of 14 randomly selected computer software engineers…
B. With 99% confidence, you can say that the population standard deviation is between $2390$ and $6913$.
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use the points to describe the data and determine the line of best fit.…
\(y=-500x + 4500\)
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the table shows the distribution, by age and gender, of the 30.0 millio…
\(0.45\)
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determining the trend line of best fit use the points to describe the d…
negative
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the annual earnings of 14 randomly selected computer software engineers…
The confidence interval for the population variance \(\sigma^{2}\) is \((5713052,47786031)\). The confidence interval for the population standard deviation \(\sigma\) is \((2390,6…
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determining the trend line of best fit use the points to describe the d…
Negative correlation, \(y=-400x + 3900\)
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evaluate each expression if ( r = 12 ), ( s = - 4 ), and ( v = - 6 ). 9…
The average difference between his income and expenses each month is \(- 150\). This means, on average, Mr. Engle's expenses exceeded his income by \(\$150\) each month.
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the following table displays a frequency distribution for the number of…
\(4,5,6,7,8\)
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the event that y takes on the value 5 can be represented as {y = 5}. th…
A.
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a. determine the probability distribution of the random variable y. (tv…
\(P(Y = 5)=0.6\), \(P(Y<5)=0.2\), \(P(Y\geq5)=0.8\)
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use the spinner shown to answer the question. assume that it is equally…
\(\frac{3}{8}\)
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2. the graph shows the cost c in dollars of w pounds of blueberries, a …
A. 1 pound of blueberries costs \(\$2.75\); D. 12 pounds of blueberries cost \(\$33\)
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a variable y of a finite population has the frequency distribution show…
a. The probability distribution is as given in the table (already provided in the problem statement). b. The event \(Y = 5\) is \(\{Y = 5\}\), \(Y<5\) is \(\{Y = 3,Y = 4\}\), \(Y\…
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the annual earnings of 14 randomly selected computer software engineers…
D. With 99% confidence, you can say that the population variance is between \(5713052\) and \(47786031\)
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sat scores: a college admissions officer takes a sample random sample o…
\(478.8<\mu<485.2\)
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a variable y of a finite population has the frequency distribution show…
\(0.6\)
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a single die is rolled twice. the 36 equally - likely outcomes are show…
\(\frac{1}{18}\)
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you select a family with three children. if m represents a male child, …
\(0\)
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the annual earnings of 14 randomly selected computer software engineers…
\((5713052,47786031)\)
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given a scatterplot and trend line, which statements are true? check al…
- The trend line should have roughly the same number of data points on each side of the line. - The trend line represents the correlation between the two variables. - The equation…
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you select a family with four children. if m represents a male child an…
\(\frac{1}{16}\)
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a fair coin is tossed 2 times in succession. the set of equally likely …
\(\frac{1}{2}\)
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latin roots terr, rupt, tract, aqua, dict some english words have roots…
1. dictator 2. detract 3. extract 4. interrupt 5. terrier 6. edict 7. aquanaut 8. rupture 9. aquaplane 10. terrace
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10. pronouns used as objects must be objective case pronouns. choose th…
10. A) me; B) me; C) her 11. make 12. CARE, NASA
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a fair coin is tossed three times in succession. the set of equally lik…
\(\frac{1}{8}\)
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(type integers or decimals. do not round.)b. use random - variable nota…
The event that \(Y\) takes on the value \(5\): \(\{Y = 5\}\) The event that \(Y\) takes on a value less than \(5\): \(\{Y\lt5\}\) The event that \(Y\) takes on a value of at least…
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you are dealt one card from a standard 52 - card deck. find the probabi…
\(\frac{3}{13}\)
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a variable y of a finite population has the frequency distribution show…
The probability distribution of the random variable \(Y\) is: | \(y\) | \(P(Y = y)\) | |-------|--------------| | \(3\) | \(0.1\) | | \(4\) | \(0.1\) | | \(5\) | \(0.6\) | | \(6\)…
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a variable y of a finite population has the frequency distribution show…
| \(y\) | \(P(Y = y)\) | | ---- | ---- | | \(3\) | \(0.1\) | | \(4\) | \(0.1\) | | \(5\) | \(0.6\) | | \(6\) | \(0.2\) |
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as part of a survey, a marketing representative asks a random sample of…
(a) The \(99\%\) confidence interval for the population variance \(\sigma^{2}\) is \(6950743<\sigma^{2}<30075903\). Interpretation: With \(99\%\) confidence, you can say that the …
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passing statistics the scatterplot and trend line show the correlation …
\(y = 3x + 55\)
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a variable y of a finite population has the frequency distribution show…
| \(y\) | \(P(Y = y)\) | |----|----| | \(3\) | \(0.1\) | | \(4\) | \(0.1\) | | \(5\) | \(0.6\) | | \(6\) | \(0.2\) |
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3. use context clues to decide the meaning of the underlined word. the …
insulting
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a 12 - sided die is rolled. the set of equally likely outcomes is {1,2,…
\(\frac{1}{12}\)
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2. a plural pronoun may have more than one antecedent. underline the an…
Markus, Jacob, and Roger
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the accompanying table describes the random variable x, the numbers of …
a. \( 0.033 \) b. \( 0.041 \) c. A. Since the probability of getting 4 sleepwalkers is the result from part (a), this is the relevant probability. d. B. Yes, since the appropriate…
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as part of a survey, a marketing representative asks a random sample of…
(a) For the interpretation of the variance confidence interval, the correct choice is D. With \(99\%\) confidence, you can say that the population variance is between \(4814657\) …
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the accompanying table describes the random variable x, the numbers of …
a. \(0.033\) b. \(0.041\) c. C. Since the probability of getting 4 or more sleepwalkers is the probability of the given or more extreme result, the result from part (b) is the rel…
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the accompanying table describes the random variable x, the numbers of …
a. \(0.033\) b. \(0.041\)
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determine whether the statement is true or false. if the statement is f…
D. This statement is true.
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the accompanying table describes the random variable x, the numbers of …
\(0.033\)