An entrepreneur is considering the purchase of a coin-operated laundry. The current owner claims that over the past five years, the mean daily revenue was $675 with a population standard deviation of $75. A sample of 30 days reveals a daily mean revenue of $625. If you were to test the null hypothesis that the daily mean revenue was $675, which test would you use?
选项:
A:Z test of a population mean;
B:Z test of a population proportion;
C: t test of population mean;
D:t test of a population proportion
发布时间:2024-03-30 12:41:44