Part 1

1) If all else remains the same, which of the following will make a confidence interval for a proportion narrower?

I) Increase the confidence level.

II) Increase sample size.

III) Increase the margin of error.

a) I only

b) II only

c) I and II

d) I and III

e) I, II, and III

Explain. Make certain to consider the formula. Explain.

2) Which of the following isnottrue?

a) A researcher who rejects a true null hypothesis has committed a Type I error.

b) A researcher who rejects the null hypothesis has computed a test statistic that is large in absolute value.

c) A researcher who rejects the null hypothesis has computed aP-value that is large in value.

d) Increasing the sample size helps to minimize the probability of making a Type II error.