A small electronics store has begun to advertise in the local newspaper. Before
ID: 3388613 • Letter: A
Question
A small electronics store has begun to advertise in the local newspaper. Before advertising, the long-term average weekly sales were $9,820. A random sample of 50 weeks while the newspaper ads were running gave a sample mean weekly sales of $10,960. Does this indicate that the population mean weekly sales is now more than $9,820? Test at the 5% level of significance. Assume the population standard deviation= $1,360. Compute the z or t value of the sample test statistic.
a. z=-5.23
b. z=3.74
c. t=4.21
d. z=5.93
e. t=3.74
Explanation / Answer
A small electronics store has begun to advertise in the local newspaper. Before