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Teaching Since: | May 2017 |
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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
A country report claims that the mean monthly expenses for a family of 4 is US$2,500 per month. You believe that the mean cost is more than US$2,500 per month. You randomly selected a sample of 300 families of 4 and found out the mean cost is US$2,750 with a standard deviation of $350. Assuming that the population is normally distributed, test, at the 10% level of significance, whether the report is underestimating the mean monthly expenses for a family of 4, by answering the following:
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(a) State the null and alternative hypotheses for the test.
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(b) Calculate the test statistics.
(c) Determine the rejection region(s) for the test.
(d) State the conclusion for the test giving reasons for your answer.
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