Essay
A sample of holiday shoppers is taken randomly from a local mall. Forty-nine shoppers were selected and asked what their average spending on gifts would be during the entire holiday season. The point estimate of the population mean was calculated as $550 and the sample standard deviation was calculated as $92.
A) Construct a 95% confidence interval of the population mean spending.
B) Explain how the central limit theorem is used in constructing this interval.
Correct Answer:
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a. [523.5745, 576.4255]
b. 
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Correct Answer:
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b.
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