SOLUTION: In a survey, 30 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 $7. Con
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Question 1177901: In a survey, 30 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 $7. 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 half-interval is t0.975 df=29 *s/sqrt(n)
=2.045*7/sqrt(30)=2.61
so interval is ($29.39, $34.61) where the mean is in the middle.
