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

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 $10. Find the margin of error at a 90% confidence level.m

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Expert Solution

Given, mean(x) = $32, standard deviation() = $10, sample size(n) = 30 and level of significance () = 10%

where is standard normal variate. So,

margin of error =

= =

The margin of error is 3.003078 at 90% confidence level.

We also calculated margin of error with the help of R software.

orchestra answered 1 year ago

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