SOLUTION: In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $43.3 and standard deviation of $14.1

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Question 1175460: In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $43.3 and standard deviation of $14.1. Construct a confidence interval at a 90% confidence level.
Express your answer in the format of
¯x ± Error.
how do I do this formula?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
 n = 11 , x̄ = 14.1  and  s = 14.1  "Sample sd"
90% confidence level  df = 10 , t = 1.81

ME = 1.81(14.1)/√11 = 7.695    |ME =+z%2At%2Fsqrt%28n%29
CI = $44.3 ±  7.7
Note:  Sample size small so CI bigger
Wish You the Best in your Studies.