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 $41.4 and standard deviation of $4.9.

Question 1191080: 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 $41.4 and standard deviation of $4.9. Estimate how much a typical parent would spend on their child's birthday gift (use a 99% confidence level). Give your answers to 3 decimal places.
Express your answer in the format of
¯
x

±
E.
$

±
$

Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
the half-interval is t(0.995,df=28)=2.763*4.9/sqrt(29)=$2.514
the interval is ($38.886, $43.914) or $41.4+/- $2.514
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