SHORTANSWER Write the word or phrase that best completes eac

SHORTANSWER. Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. 28) 28) Under what three conditions is it appropriate to use the t distribution in place of the standard normal distribution? 29) Mark wanted to estimate the mean number of years of education of adults in his city. He 29) waited outside a public library and interviewed every tenth adult leaving. Based on this sample, he constructed a confidence interval for the mean number of years of education of adults in the city. Do you think this confidence interval will give a good estimate? Why or why not? MULTIPLECHOICE. Choose the one alternative that best completes the statement or answers the question. Use the confidence level and sample data to find a confidence interval for estimating the population u. Round your answer to the same number of decimal places as the sample mean. 30) 39 packages are randomly selected from packages received by a parcel service. The sample has a 30) mean weight of 29.9 pounds a a standard deviation of3.0 pounds. What is the 95% confidence interval for the true mean weight, H, of all packages received by the parcel service? B) 29.1 lb k u

Solution

28 ) use the t-distribution table when working problems when the standard deviation (?) is not known and the sample size is small.

29) yes,