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# Question 3 (10 points) The average sales per store of ABC Inc.'s best-selling product in a supermarket chain last year was $12,000.

**Question 3 (10 points)**

The average sales per store of ABC Inc.'s best-selling product in a supermarket chain **last year** was $12,000. A random sample of 61 stores selected from the chain shows that **this year** the average sales per store is $13,500 with a sample standard deviation of $12,000. Determine whether there has been a significant increase in the average sales per store.

- State the null and alternative hypotheses to be tested.
**(2 points)** - Compute the test statistic.
**(2 points)** - Determine the critical value for this test at the 0.05 level of significance.
**(2 points)** - What do you conclude?
**(2 points)** - Construct a 95% confidence interval for the average sales per store.
**(2 points)**