Kizspy | Question: 68 (Choose 1 answer)
A manager of the credit department for an oil company would like to determine whether the mean monthly balance of credit card holders is equal to $80. An auditor selects a random sample of 100 accounts and finds that the mean owed is $85.40 with a standard deviation of $13.65. If you were to conduct a test to determine whether the auditor should conclude that there is evidence that the mean balance is different from $80, which test would you use?
A. Z-test of a population mean.
B. Z-test of a population proportion.
C. t-test of a population mean.
D. t-test of a population proportion.
