Quiz: Chapter 9 Quiz on: 1 pt 2 of 8 (0 This 90% confidence level requiressutjec

Question

Quiz: Chapter 9 Quiz on: 1 pt 2 of 8 (0 This 90% confidence level requiressutjects. (Round up to the nearest subject.) (b) How many subjects aro needed to estimate te moan number of books read the previous year within three tooks with 90% oofdro? This 90% confidence level requires subjects (Round up to the nearest subject) (c) What eflect 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 halves the sample size. O C. Doubling the required aocuracy nearly quarters the sample size. D. Doubling the required accuracy nearly doubles the sample size. (d) How many subjects are needed to estimate the mean number of books read the previous year within sk books with 99% oorfidence? This 90% confidence level requiressubjects. (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 leval of confidence increases the sample size required. For a fxed margin o O c. O D· Increasing the level of cofidence decreases the sample of error, greater confidence can be achieved with a smaller sample size the level of the level of decreases the sample size required. For a fxed margin of error, greater confidence can be achieved with a larger sample size. can be achiaved with a larger sample size. increases the sample size required. For a fxed margin of ermor, greater size required. For a fixed margin of error, greater confidence can be achieved with a smaller sample size

Explanation / Answer

a)

b)

c)

option A is correct

d)

option C is correct

for 90 % CI value of z= 1.6449 standard deviation = 11.2 margin of error E = 6 required sample size n=(z/E)2                                         = 10

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