Sales at a fast-food restaurant average $7,200 per day. The restaurant decided to introduce an advertising campaign to i

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Sales at a fast-food restaurant average $7,200 per day. The
restaurant decided to introduce an advertising campaign to increase
daily sales. To determine the effectiveness of the advertising
campaign, a sample of 64 days of sales were taken. They found that
the average daily sales were $7,360 per day. From past history, the
restaurant knew that its population standard deviation is about
$1,000. The value of the test statistic is ........
a. 1.28
b. 1.96
c. -1.28
d. 0.16