SOLUTION: In a survey, 29 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $30 and standard deviation of $10. Co

Question 1177957: In a survey, 29 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $30 and standard deviation of $10. Construct a confidence interval at a 95% confidence level.
Give your answers to one decimal place.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
the 95% CI half-interval is t (0.975, df=28)*10/sqrt(29); t=2.048
this is 3.80
the interval is ($26.2, $33.8)

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