Constructing a Confidence Interval for a Population Mean
In a survey, 24 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $40 and standard deviation of $4. Construct a confidence interval at a 90% confidence level.Give your answers to one decimal place. Enter the confidence interval in the form:
Sample Mean ± Margin of Error            ±
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