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StatisticsQ&A LibraryIn a survey, 20 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $37.7 and standard deviation of $16.7. Estimate how much a typical parent would spend on their child's birthday gift (use a 95% confidence level). Give your answers to 3 decimal places.Express your answer in the format of ¯xx¯ ±± E. $ ±± $Question

Asked Nov 23, 2019

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In a survey, 20 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $37.7 and standard deviation of $16.7. Estimate how much a typical parent would spend on their child's birthday gift (use a 95% confidence level). Give your answers to 3 decimal places.

Express your answer in the format of ¯xx¯ ±± E.

$ ±± $

Step 1

**Given information:**

It is given that mean is 37.7 (*x*-bar); the standard deviation (*s*) is 16.7; the sample size *n* is 20; confidence level is 95%.

Step 2

**Confidence interval:**

Since the population standard deviation is not given, **t-test **is appropriate here to compute th...

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