In a survey, 27 people were asked how much they spent on their child's last birthday...

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In a survey, 27 people were asked how much they spent on their child's last birthday...

In a survey, 27 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $32 and standard deviation of $12. Construct a confidence interval at a 98% confidence level.

Give your answers to one decimal place.

math Statistics-And-Probability

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Answer 1

Answer #1

At 98% confidence interval the critical value is t^* = 2.479

The 98% confidence interval is

+/- t^* * s/

= 32 +/- 2.479 * 12/

= 32 +/- 5.725

= 26.275, 37.725

= 26.3, 37.7

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Answer 2

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