A. 0.2323 to 0.3075 B. 0.2325 to 0.3075 C. 0.2325 to 0.3185 D. 0.2323 to 0.3185 Question 26 of 40
0.0/ 2.5 Points Which line of the three shown in the scatter diagram below fits the data best? A. A B. B C. C D. All the lines are equally good
Question 27 of 40 0.0/ 2.5 Points Which graph has two groups of data, correlations within each group, but no correlation among all the data? A. B. C.
D. Question 28 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. A. 274
B. 284 C. 264 D. 272 Question 29 of 40 0.0/ 2.5 Points Select the best fit line on the scatter diagram below.
A. A B. B C. C D. All of the lines are equally good Question 30 of 40 0.0/ 2.5 Points Select the best fit line on the scatter diagram below.
A. A B. B C. C D. None of the lines is the line of best fit Question 31 of 40 0.0/ 2.5 Points
A random sample of 30 households was selected from a particular neighborhood. The number of cars for each household is shown below. Estimate the mean number of cars per household for the population of households in this neighborhood. Give the 95% confidence interval. A. 1.14 to 1.88 B. 1.12 to 1.88 C. 1.12 to 1.98 D. 1.14 to 1.98
Question 32 of 40 0.0/ 2.5 Points The graph shows a measure of fitness (y) and miles walked weekly. Identify the probable cause of the correlation. A. The correlation is coincidental. B. There is a common underlying cause of the correlation. C. There is no correlation between the
variables. D. Walking is a direct cause of the fitness. Question 33 of 40 0.0/ 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? A. 0.8 standard deviations above the mean
B. 0.8 standard deviations below the mean C. 7.3 standard deviations below the mean D. 207 standard deviations below the mean Question 34 of 40 0.0/ 2.5 Points Suggest the cause of the correlation among the data.
The graph shows strength of coffee (y) and number of scoops used to make 10 cups of coffee (x). Identify the probable cause of the correlation. A. The variation in the x variable is a direct cause of the variation in the y variable. B. There is no correlation between the variables. C. The correlation is due to a common underlying cause.
D. The correlation between the variables is coincidental. Question 35 of 40 0.0/ 2.5 Points A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval.
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- Tom Pope