Question 30 of 40 
0.0/ 2.5 Points 
A researcher wishes to estimate the mean amount of money spent per month on food by households in a certain neighborhood. She desires a margin of error of $30. Past studies suggest that a population standard deviation of $248 is reasonable. Estimate the minimum sample size needed to estimate the population mean with the stated accuracy.
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A. 274 

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B. 284 

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C. 264 

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D. 272 


Question 31 of 40 
0.0/ 2.5 Points 
Select the best fit line on the scatter diagram below.
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A. A 

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B. B 

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C. C 

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D. All of the lines are equally good 


Question 32 of 40 
2.5/ 2.5 Points 
Eleven female college students are selected at random and asked their heights. The heights (in inches) are as follows:
67, 59, 64, 69, 65, 65, 66, 64, 62, 64, 62
Estimate the mean height of all female students at this college. Round your answer to the nearest tenth of an inch if necessary.
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A. It is not possible to estimate the population mean from this sample data 

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B. 64.3 inches 

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C. 64.9 inches 

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D. 63.7 inches 


Question 33 of 40 
2.5/ 2.5 Points 
Among a random sample of 500 college students, the mean number of hours worked per week at noncollege related jobs is 14.6. This mean lies 0.4 standard deviations below the mean of the sampling distribution. If a second sample of 500 students is selected, what is the probability that for the second sample, the mean number of hours worked will be less than 14.6?
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A. 0.5 

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B. 0.6179 

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C. 0.6554 

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D. 0.3446 


Question 34 of 40 
2.5/ 2.5 Points 
A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 560 college students showed that 27% of them had, or intended to, cheat on examinations. Find the 95% confidence interval.
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A. 0.2323 to 0.3075 

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B. 0.2325 to 0.3075 

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C. 0.2325 to 0.3185 

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D. 0.2323 to 0.3185 


Question 35 of 40 
0.0/ 2.5 Points 
Select the best estimate of the correlation coefficient for the data depicted in the scatter diagram.
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A. 0.9 

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B. 0.9 

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C. 0.5 

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D. 0.5 


Question 36 of 40 
2.5/ 2.5 Points 
Monthly incomes of employees at a particular company have a mean of $5954. The distribution of sample means for samples of size 70 is normal with a mean of $5954 and a standard deviation of $259. Suppose you take a sample of size 70 employees from the company and find that their mean monthly income is $5747. How many standard deviations is the sample mean from the mean of the sampling distribution?
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A. 0.8 standard deviations above the mean 

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B. 0.8 standard deviations below the mean 

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C. 7.3 standard deviations below the mean 

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D. 207 standard deviations below the mean 


Question 37 of 40 
2.5/ 2.5 Points 
A sample of nine students is selected from among the students taking a particular exam. The nine students were asked how much time they had spent studying for the exam and the responses (in hours) were as follows:
18, 7, 10, 13, 12, 16, 5, 20, 21
Estimate the mean study time of all students taking the exam. Round your answer to the nearest tenth of an hour if necessary.
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A. 13 hours 

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B. 12.2 hours 

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C. 13.6 hours 

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D. It is not possible to estimate the population mean from this sample data 


Question 38 of 40 
0.0/ 2.5 Points 
The scatter plot and bestfit line show the relation between the price per item (y) and the availability of that item (x) in arbitrary units. The correlation coefficient is 0.95. Determine the amount of variation in pricing explained by the variation in availability.
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A. 5% 

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B. 10% 

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C. 95% 

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D. 90% 


Question 39 of 40 
2.5/ 2.5 Points 
Sample size = 400, sample mean = 44, sample standard deviation = 16. What is the margin of error?
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A. 1.4 

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B. 1.6 

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C. 2.2 

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D. 2.6 


Question 40 of 40 
2.5/ 2.5 Points 
The graph shows a measure of fitness (y) and miles walked weekly. Identify the probable cause of the correlation.
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A. The correlation is coincidental. 

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B. There is a common underlying cause of the correlation. 

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C. There is no correlation between the variables. 

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D. Walking is a direct cause of the fitness. 

