1 In constructing a confidence interval estimate of the popu

1.) In constructing a confidence interval estimate of the population mean you decide to select 49 random observations to get your point estimate of the mean (sample mean). Your friend is also constructing a similar confidence interval estimate but decides to use a sample size of 36 random observations. Which of the following is true?

a.) Your confidence interval estimate is narrower

b.) Your friend’s confidence interval estimate has a greater degree of confidence

c.) Your confidence interval estimate is wider

d.) Your confidence interval estimate has a greater degree of confidence

7.) The confidence interval estimate of the population mean is constructed around the sample mean (i.e. we add and subtract some amount to the mean).

a.) True

b.) False

8.) The confidence interval estimate of the population mean will be wider for a 95% confidence level than for a 90% confidence level. (assumes the sample size and sample standard remain constant)

a.) True

b.) False

9.) With respect to sampling methods the difference between a sample statistic and its corresponding population parameter is called the sampling error. True or false?

a.) True

b.) False

10.) The confidence interval estimate of the population mean will be _______ for a 95% confidence level than for a 90% confidence level. (Assuming the sample size and the standard deviation are constant)

a.) Narrower

b.) Wider

c.) The same

d.) Indeterminant

Solution

1)

d.) Your confidence interval estimate has a greater degree of confidence

7)

a.) True

8)

a.) True

9)

b.) False

10)

b.) Wider