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During the winter of? 2008-2009, the average utility bill for residents of a certain state was...

During the winter of? 2008-2009, the average utility bill for residents of a certain state was ?$184 per month. A random sample of 30 customers was selected during the winter of? 2009-2010, and the average bill was found to be ?$174.49 with a sample standard deviation of ?$19.66. Complete parts a and b below. ?a) Using alphaequals0.05?, does this sample provide enough evidence to conclude that the average utility bill in this state was lower in the winter of? 2009-2010 than it was in the winder of? 2008-2009? Determine the hypotheses. A. Upper H 0?: mu not equals 184 and Upper H 1?: mu equals 184 B. Upper H 0?: mu less than or equals 184 and Upper H 1?: mu greater than 184 C. Upper H 0?: mu equals 184 and Upper H 1?: mu not equals 184 D. Upper H 0?: mu greater than or equals 184 and Upper H 1?: mu less than 184

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Answer #1

Hypotheses:

Ho: \mu = 184

Ha: \mu < 184

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