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

question 115

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.

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Definitions:

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