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When the level of confidence and sample size remain the

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Reference no: EM13576829

Q1. The width of a confidence interval will be:

A. Narrower for 95% confidence than 99% confidence

B. Wider for a sample size of 100 than for a sample size of 50

C. Wider for 90% confidence than 95% confidence

D. Narrower when the sample standard deviation (s) is large than when s is small

Q2. When the level of confidence and sample size remain the same, a confidence interval for a population proportion p will be __________ when p(1-p) is larger than when p(1-p) is smaller.

A. Narrower

B. Wider

C. Neither A nor B, they will be the same

D. Cannot tell from the information given

Q3. A confidence interval increases in width as

A. The level of confidence increases

B. n decreases

C. s increases

D. All of the above

E. None of the above

Q4. In a manufacturing process a random sample of 9 bolts manufactured has a mean length of 3 inches with a standard deviation of .3 inches. What is the 95% confidence interval for the true mean length of the bolt?

A. 2.804 to 3.196

B. 2.308 to 3.692

C. 2.769 to 3.231

D. 2.412 to 3.588

E. 2.814 to 3.186

Reference no: EM13576829

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