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4. A random sample of 5000 taxpayers was selected and the amount of their 2018 tax refund was recorded. (5pt) Sample results are provided below:

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4. A random sample of 5000 taxpayers was selected and the amount of their 2018 tax refund was recorded. (5pt) Sample results are provided below: Sample Results Sample size 5000 Sample mean $681 Sample Standard Deviation $275 a. What is the point estimate for the mean tax refund for all taxpayers? Describe the property of sampling distribution that help you to reach this answer. b. Determine the 99% Confidence Interval for the mean tax refund for all taxpayers

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