The Department of Economic and Community Development (DECD)reported that in 2009 the average number of new jobs created per county was 450.The department also provided the following information regarding a sample of 5 counties in 2010.
a.Compute the sample average and the standard deviation for 2010.
b.We want to determine whether there has been a significant decrease in the average number of jobs created.Provide the null and the alternative hypotheses.
c.Compute the test statistic.
d.Compute the p-value;and at 95% confidence,test the hypotheses.Assume the population is normally distributed.
Definitions:
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