Question
During the winter of2008-2009, the average utility bill for residents of a certain state was $ 180 per month. A random sample of 40 customers
During the winter of2008-2009, the average utility bill for residents of a certain state was $180 per month. A random sample of 40 customers was selected during the winter of2009-2010, and the average bill was found to be $170.18 with a sample standard deviation of $20.68. Complete parts a and b below.
a) Using =0.05, does this sample provide enough evidence to conclude that the average utility bill in this state was lower in the winter of2009-2010 than it was in the winder of2008-2009?
Determine the hypotheses.
A.H0:180 and H1:>180
B.H0:=180 and H1:180
C.H0:180 and H1:=180
D.H0:180 and H1:<180
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