According to the California Strawberry Commission, over the course of the 1999 s

Question

According to the California Strawberry Commission, over the course of the 1999 strawberry season, an average of 11 advertisements per chain of California grocery stores featured strawberries. Suppose a simple random sample of 30 grocery chains during 2004 growing season indicated that 10.28 average number of advertisements featured strawberries, with a standard deviation of 2.05 advertisements per chain. Assume the number of advertisements' per grocery chain is normally distributed. If we are to conduct a formal hypothesis test using the t-statistic, determine whether there is sufficient evidence to conclude with 05% confidence that the average number of advertisements featuring strawberries in 2004 is lower than the statewide average established in 1999.

a. what is the appropriate null hypothesis?

b. what is the appropriate alternative hypothesis?

Explanation / Answer

a)

Null hypothesis = the average number of advertisements featuring strawberries in 2004 is not lower than the

statewide average established in 1999.

b)

Alternative hypothesis:  the average number of advertisements featuring strawberries in 2004 is lower than the

statewide average established in 1999

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