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

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.
RELATED QUESTIONS
In a survey, 30 people were asked how much they spent on their child's last birthday... (answered by math_tutor2020)

In a survey, 13 people were asked how much they spent on their child's last birthday... (answered by Theo,math_tutor2020)

In a survey, 30 people were asked how much they spent on their child's last birthday... (answered by Boreal)

In a survey, 29 people were asked how much they spent on their child's last birthday... (answered by Boreal)

In a survey, 11 people were asked how much they spent on their child's last birthday... (answered by ewatrrr)

In a survey, 29 people were asked how much they spent on their child's last birthday... (answered by Boreal)

In a survey, 21 people were asked how much they spent on their child's last birthday... (answered by math_tutor2020)

In a survey, 11 people were asked how much they spent on their child's last birthday... (answered by Theo)

In a survey, 12 people were asked how much they spent on their child's last birthday... (answered by ikleyn,math_tutor2020)