A survey of several 11 to 12 year olds recorded the following amounts spent on a trip to the mall: $19.22, $24.18, $31.73, $27.61, $24.73, $27.77, $23.17

Construct the 80% confidence interval for the average amount spent by 11 to 12 year olds on a trip to the mall. Assume the population is approximately normal.

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Step 1 of 4:

Calculate the sample mean for the given sample data. Round your answer to two decimal places.

Step 2 of 4:

Calculate the sample standard deviation for the given sample data. Round your answer to two decimal places.

Step 3 of 4:

Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

Step 4 of 4:

Construct the 80%80% confidence interval. Round your answer to two decimal places.