1. If you decrease the sample size from 100 to 50, the confidence interval will

Question

1. If you decrease the sample size from 100 to 50, the confidence interval will A. increase by 50%. B. also decrease. C. decrease by 50%. D. None of the above.

2. A confidence interval

A. always includes the population parameter.

B. always includes the point of estimate.

C. can’t include a value of less than 0.

D. Both b and c

3. A political party wishes to estimate the proportion of voters that support the party in a particular state. The party will poll a random sample of n voters from the state. Which of the following is likely to result in the largest margin of error?

A. n = 500, confidence level = 95%

B. n = 500, confidence level = 99%

C. n = 500, confidence level = 90%

D. n = 100, confidence level = 95%

E. n = 100, confidence level = 90%

4. Suppose a population consisted of 500 patients. How big the sample size should be to have a maximum sampling error of 5%, if population is normally distributed?

A. 50

B. 25

C. 5

D. Depends on population standard deviation

E. Can’t be determined.

Explanation / Answer

1)D. None of the above

2)

B. always includes the point of estimate.

3)

for higher margin of error sample size sholuld be lowast and CI sould be high

D. n = 100, confidence level = 95%

4)

D. Depends on population standard deviation

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