The sales of a grocery store had an average of $8,000 per
day. The store introduced several advertising campaigns in
order to increase sales.
To determine whether or not the advertising campaigns have been
effective in increasing sales, a sample of 75 days of sales was
selected. It was found that the average was $8,250 per
day. From past information, it is known that the standard
deviation of the population is
$1,200.
What is the value of the test statistic? Round your answer
to three decimal places.