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In a survey, 22 people were asked how much they spent on their child's last birthday...

In a survey, 22 people were asked how much they spent on their child's last birthday gift. The results were roughly shaped as a normal curve with a mean of $43 and standard deviation of $20. Construct a confidence interval at a 80% confidence level. Give your answers to one decimal place. ？±？ (Note this is NOT in interval form, so check your answer carefully)

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