Question
Asked Apr 12, 2019
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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

Constructrhe 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.

1.Calculate the standard deviation Round to two decimal places.

2.find critical value, round to 3 decimals

3. Construct the 90% confidence interval. Round 2 decimal places. The lower and upper endpoints.

 
 
 
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Expert Answer

Step 1

In this question we have data and using that data we have to find the standard deviation and confidence interval.

Step 2

Here we have calculated the mean and standard deviatio...

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Hypothesis Testing

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