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In a survey, 10 people were asked how much they spent on their child's last birthday...

In a survey, 10 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $38.8 and standard deviation of $13.7. Construct a confidence interval at a 90% confidence level.

Express your answer in the format of ¯x ± Error.

Math   Statistics-And-Probability   
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