According to the IRS, taxpayers calling the IRS in 2017 waited 14 minutes on average for an IRS telephone assister to answer. Do callers who use the IRS help line early in the day have a shorter wait? Suppose a sample of 50 callers who placed their calls to the IRS in the first 30 minutes that the line is open during the day have a mean waiting time of 12 minutes before an IRS telephone assister answers. Based on data from past years, you decide that it is reasonable to assume that the standard deviation of waiting times is 10 minutes. Using these sample results, can you conclude that the waiting time for calls placed during the first 30 minutes the IRS help line is open each day is significantly less than the overall mean waiting time of 14 minutes? Use a = 0.05. State the hypotheses. Ho: 4 - Select your answer - Ha: 4 - Select your answer - What is the p-value (to 4 decimals)? Can you conclude that callers who use the IRS help-line early in the day have a shorter wait? - Select your answer - v

According to the IRS, taxpayers calling the IRS in 2017 waited 14 minutes on average for an IRS telephone assister to answer. Do callers who use the IRS help line early in the day have a shorter wait? Suppose a sample of 50 callers who placed their calls to the IRS in the first 30 minutes that the line is open during the day have a mean waiting time of 12 minutes before an IRS telephone assister answers. Based on data from past years, you decide that it is reasonable to assume that the standard deviation of waiting times is 10 minutes. Using these sample results, can you conclude that the waiting time for calls placed during the first 30 minutes the IRS help line is open each day is significantly less than the overall mean waiting time of 14 minutes? Use a = 0.05. State the hypotheses. Ho: 4 - Select your answer - Ha: 4 - Select your answer - What is the p-value (to 4 decimals)? Can you conclude that callers who use the IRS help-line early in the day have a shorter wait? - Select your answer - v

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.4: Distributions Of Data

Problem 19PFA

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