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A survey of several 10 to 11 year olds recorded the following amounts spent on a...

A survey of several 10 to 11 year olds recorded the following amounts spent on a trip to the mall:

$19.17,$21.18,$20.38,$25.08 $⁢19.17,$⁢21.18,$⁢20.38, $⁢25.08

Construct the 90%90% confidence interval for the average amount spent by 10 to 11 year olds on a trip to the mall. Assume the population is approximately normal.

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