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People were polled on how many books they read the previous year. Initial survey results indicate that s = 17.9 books. Complete parts (a) through (d) below. 17 Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) (b) How many subjects are needed to estimate the mean number of books read the previous year within three books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) (c) What effect does doubling the required accuracy have on the sample size? O A. Doubling the required accuracy nearly quadruples the sample size. O B. Doubling the required accuracy nearly quarters the sample size. O C. Doubling the required accuracy nearly doubles the sample size. O D. Doubling the required accuracy nearly halves the sample size. (d) How many subjects are needed to estimate the mean number of books read the previous year within six books with 99% confidence? This 99% confidence level requires subjects. (Round up to the nearest subject.) Compare this result to part (a). How does increasing the level of confidence in the estimate affect sample size? Why is this reasonable? O A. Increasing the level of confidence decreases the sample size required. For a fixed margin of error, greater confidene O B. Increasing the level of confidence decreases the sample size required. For a fixed margin of error, greater confidene O C. Increasing the level of confidence increases the sample size required. For a fixed margin of error, greater confidenc O D. Increasing the level of confidence increases the sample size required. For a fixed margin of error, greater confidenc 17: Partial Critical Value Table Level of Confidence, Critical Value, za/2 α Area in Each Tail, (1 - a) • 100% 90% 0.05 1.645 95% 0.025 1.96 99% 0.005 2.575

People were polled on how many books they read the previous year. Initial survey results indicate that s = 17.9 books. Complete parts (a) through (d) below. 17 Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) (b) How many subjects are needed to estimate the mean number of books read the previous year within three books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) (c) What effect does doubling the required accuracy have on the sample size? O A. Doubling the required accuracy nearly quadruples the sample size. O B. Doubling the required accuracy nearly quarters the sample size. O C. Doubling the required accuracy nearly doubles the sample size. O D. Doubling the required accuracy nearly halves the sample size. (d) How many subjects are needed to estimate the mean number of books read the previous year within six books with 99% confidence? This 99% confidence level requires subjects. (Round up to the nearest subject.) Compare this result to part (a). How does increasing the level of confidence in the estimate affect sample size? Why is this reasonable? O A. Increasing the level of confidence decreases the sample size required. For a fixed margin of error, greater confidene O B. Increasing the level of confidence decreases the sample size required. For a fixed margin of error, greater confidene O C. Increasing the level of confidence increases the sample size required. For a fixed margin of error, greater confidenc O D. Increasing the level of confidence increases the sample size required. For a fixed margin of error, greater confidenc 17: Partial Critical Value Table Level of Confidence, Critical Value, za/2 α Area in Each Tail, (1 - a) • 100% 90% 0.05 1.645 95% 0.025 1.96 99% 0.005 2.575

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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13. People were polled on how many books they read the previous year. Initial survey results indicate that s = 17.9 books. Complete parts (a) through (d) below. 17 Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) (b) How many subjects are needed to estimate the mean number of books read the previous year within three books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) (c) What effect does doubling the required accuracy have on the sample size? A. Doubling the required accuracy nearly quadruples the sample size. O B. Doubling the required accuracy nearly quarters the sample size. O C. Doubling the required accuracy nearly doubles the sample size. O D. Doubling the required accuracy nearly halves the sample size. (d) How many subjects are needed to estimate the mean number of books read the previous year within six books with 99% confidence? This 99% confidence level requires subjects. (Round up to the nearest subject.) Compare this result to part (a). How does increasing the level of confidence in the estimate affect sample size? Why is this reasonable? O A. Increasing the level of confidence decreases the sample size required. For a fixed margin of error, greater confiden O B. Increasing the level of confidence decreases the sample size required. For a fixed margin of error, greater confiden C. Increasing the level of confidence increases the sample size required. For a fixed margin of error, greater confidenc O D. Increasing the level of confidence increases the sample size required. For a fixed margin of error, greater confidenc 17: Partial Critical Value Table Level of Confidence, Critical Value, za / 2 (1- a) • 100% Area in Each Tail, 2 90% 0.05 1.645 95% 0.025 1.96 99% 0.005 2.575
Transcribed Image Text:13. People were polled on how many books they read the previous year. Initial survey results indicate that s = 17.9 books. Complete parts (a) through (d) below. 17 Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) (b) How many subjects are needed to estimate the mean number of books read the previous year within three books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) (c) What effect does doubling the required accuracy have on the sample size? A. Doubling the required accuracy nearly quadruples the sample size. O B. Doubling the required accuracy nearly quarters the sample size. O C. Doubling the required accuracy nearly doubles the sample size. O D. Doubling the required accuracy nearly halves the sample size. (d) How many subjects are needed to estimate the mean number of books read the previous year within six books with 99% confidence? This 99% confidence level requires subjects. (Round up to the nearest subject.) Compare this result to part (a). How does increasing the level of confidence in the estimate affect sample size? Why is this reasonable? O A. Increasing the level of confidence decreases the sample size required. For a fixed margin of error, greater confiden O B. Increasing the level of confidence decreases the sample size required. For a fixed margin of error, greater confiden C. Increasing the level of confidence increases the sample size required. For a fixed margin of error, greater confidenc O D. Increasing the level of confidence increases the sample size required. For a fixed margin of error, greater confidenc 17: Partial Critical Value Table Level of Confidence, Critical Value, za / 2 (1- a) • 100% Area in Each Tail, 2 90% 0.05 1.645 95% 0.025 1.96 99% 0.005 2.575
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