Author Question: A grocery store has an average sales of 8000 per day. The store introduced several advertising ... (Read 125 times)

Metfan725 · **on:** Jun 24, 2018

A grocery store has an average sales of 8000 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 64 days of sales was selected. It was found that the average was 8300 per day. From past information, it is known that the standard deviation of the population is 1200 . The p-value is
a. 2.000.
b. .9772.
c. .0228.
d. .5475.

Question 2

The advantage of nonprobabilistic sampling is that it is inexpensive and
a. provides statistically valid statements about the precision of the estimate.
b. can provide valid parameter estimates.
c. is error free.
d. ease of implementation.