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4. The owner of a coffee shop wants to learn about coffee buying habits from his...

4. The owner of a coffee shop wants to learn about coffee buying habits from his customers. 60 customers are selected a week and the average purchase result (in 10,000 rupiahs) is 7.25 with a standard deviation of 1.75. Hypothesis test at α = 0.05 that the average number of purchases does not equal 6.50?

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