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QUESTION
In a survey, 81 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...
In a survey, 81 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 and standard deviation of $8.
Construct a confidence interval in the form estimate ± margin of error at a 90% confidence level.
