An Entrepreneur Is Considering the Purchase of a Coin-Operated Laundry

question 14

Multiple Choice

An entrepreneur is considering the purchase of a coin-operated laundry. The current owner claims that over the past 5 years, the mean daily revenue was $675 with a standard deviation of $75. A
Sample of 30 days reveals a daily mean revenue of $625 and a standard deviation of $70. Which
Of the following tests will be the most appropriate?

• A) t test for the mean.
• B) Z test for the proportion.
• C) Pooled-variance t test.
• D) Separate-variance t test.