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Lee Bradley

06/10/2020 · Elementary School

In a survey, \( 31 \) people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of \( \$ 49 \) and standard deviation of \( \$ 9 . \) Find the margin of error for a \( 90 \% \) confidence level. 

 

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expertExpert-Verified Answer

Peterson Chandler
Supertutor
4.0 (17votes)

\(\overline { x } = 4 P b = 9 \) 

\( z _ { 5 } \% \approx 1.645\) 

\(49 \pm 1.645 \times \frac { 9 } { \sqrt { 31 } } \) 

\( ( 46.34,51.70 ) \) 

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