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A study found that 8- to 12-year-olds spend an average of $21.50 per trip to a...

  1. A study found that 8- to 12-year-olds spend an average of $21.50 per trip to a mall. If a sample of 51 children was used, find the 95% confidence interval for the mean. Assume that the population is approximately normally distributed, and the sample standard deviation is $1.75.

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