The sales of a grocery store had an average of $8,000 per day

The sales of a grocery store had an average of $8,000 per day. The
store started an aggressive advertising campaign in order to increase sales. To determine whether or not the advertising campaign has been effective, i.e. the sales increased, a sample of 66 days was selected. For this sample the mean was $8,300 per day and the standard deviation $1,200.

13: The correct Alternative Hypothesis for this problem is

A. HA: > 8,000
B. HA: ≥ 8,000
C. HA: µ > 8,300
D. HA: µ ≥ 8,000
E. HA: none of the above

14: The value of the test statistic is
A) -2.03
B) 2.03.
C) -2.00
D) 2.00
E) none of the above

15: The p-value is
A) 0.0248
B) 0.0228
C) 0.9752
D) 0.9768
E) 0.0232

16: At the 5% level of significance, we conclude that the advertising campaign
A) Increased sales
B) Decreased sales
C) Did not much affect sales
D) Was not worth the cost
E) None of the above

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