1. The width of a confidence interval estimate for a proportion will be A. Narro

Question

1. The width of a confidence interval estimate for a proportion 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. Narrower for 95% confidence than 90% confidence. C. D. Narrower when the sample proportion is 0.50 than when the sample proportion is 0.20. 2. In constructing of confidence interval. if all other quantities are unchanged, an increase in th sample size will lead to a interval Narrower B. Wider. C. Less significant. biased 3. If you were constructing a 95% confidence interval of the population mean based on a samp of n 25 where the standard deviation is 0.05, the critical value of will be A. 2.797 B. 2.787 1.96 4. The best point estimate of P. the population proportion is 5. The r distribution is used to develop confidence interval estimate of the population proportion when the population standard deviation is unknown. A. True B. False

Explanation / Answer

Option 1 is true because 95% of the sample aveages reduces width of confidence interval than 99%.

Option 2 is false because larger sample size reduces the size of confidence interval by ratio of 1 / sqrt(n),

n = SAMPLE SIZE.

Option 3 is false because higher confidence interval means larger interval.

Option 4 is false because Sample proportion increases confidence interval by ratio of SQRT[p * (1 - p)/n],

p = SAMPLE PROPORTION..

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