7. A local pizza place claims that they average a delivery time of 6.46 minutes.

Question

7. A local pizza place claims that they average a delivery time of 6.46 minutes. To test this claim, you order 10 pizzas over the next month at random times on random days of the week. You calculate that the average delivery time is 8.56 minutes with a standard deviation of 1.068 minutes. You create a 90% confidence interval of (7.941, 9.179). Of those listed below, what is the best conclusion you can make?

Question 8 options:

1)

2)

3)

4)

5)

1)

We cannot determine the proper interpretation based on the information given.

2)

You are 90% confident that the average delivery time is less than 6.46 minutes.

3)

The average delivery time does not significalty differ from 6.46 minutes.

4)

The percentage of pizzas that arrive around 6.46 minutes is 90%.

5)

You are 90% confident that the average delivery time is greater than 6.46 minutes.

Explanation / Answer

Correct Answer: Option (5) You are 90% confident that the average delivery time is greater than 6.46 minutes.

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