Please show the work you did to find your answer for part A, B, C, and D. Thank you so much!!

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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ISBN:9780079039897
Author:Carter
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Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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Please show the work you did to find your answer for part A, B, C, and D. Thank you so much!!
3. The Metropolitan Bus Company claims that the mean waiting time for a bus during rush hour
is less than 5 minutes. A random sample of 20 waiting times has a mean of 4.2 minutes with a
standard deviation of 2.1 minutes.
a) The sample mean is 4.2. Before doing any work, what is gut feeling about the chances of
the population mean beirg less than or equal to 5? Do you think that the sample mean of 4.2 is
low enough and provides enough evidence?
b) Which will you use to perform the hypothesis test, a z-test or t-test? Explain why.
c) At a = 0.01, test the bus company's claim. Assume the distribution is normally distributed.
d) Complete the hypothesis test and compare your results with your guess in part a.
Transcribed Image Text:3. The Metropolitan Bus Company claims that the mean waiting time for a bus during rush hour is less than 5 minutes. A random sample of 20 waiting times has a mean of 4.2 minutes with a standard deviation of 2.1 minutes. a) The sample mean is 4.2. Before doing any work, what is gut feeling about the chances of the population mean beirg less than or equal to 5? Do you think that the sample mean of 4.2 is low enough and provides enough evidence? b) Which will you use to perform the hypothesis test, a z-test or t-test? Explain why. c) At a = 0.01, test the bus company's claim. Assume the distribution is normally distributed. d) Complete the hypothesis test and compare your results with your guess in part a.
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