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In a survey, 491 people were asked how much they spent on their child's last birthday...

In a survey, 491 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $39.84 and standard deviation of $9.06. Estimate how much a typical parent would spend on their child's birthday gift (use a z-interval at a 80% confidence level). Give your answers to 2 decimal places.

Express your answer in the format of x ± E.

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TOPIC:Confidence interval for the population mean.

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