In a survey, 21 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 and standard deviation of $6. Find the margin of error at a 90% confidence level.

MATLAB: An Introduction with Applications
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In a survey, 21 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 and standard deviation of
$6. Find the margin of error at a 90% confidence level.
Transcribed Image Text:In a survey, 21 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 and standard deviation of $6. Find the margin of error at a 90% confidence level.
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