In a survey, 24 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $38 and standard deviation of $12. Construct a confidence interval at a 80% confidence level. Give your answers to one decimal place. 土

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In a survey, 24 people were asked how much they spent on their child's last birthday gift. The results were
roughly bell-shaped with a mean of $38 and standard deviation of $12. Construct a confidence interval at a
80% confidence level.
Give your answers to one decimal place.
土
Transcribed Image Text:In a survey, 24 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $38 and standard deviation of $12. Construct a confidence interval at a 80% confidence level. Give your answers to one decimal place. 土
An engineer wishes to determine the width of a particular electronic component. If she knows that the
standard deviation is 2.3 mm, how many of these components should she consider to be 90% sure of knowing
the mean will be within ±0.1 mm?
O1432
869
7572
23
38
Transcribed Image Text:An engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 2.3 mm, how many of these components should she consider to be 90% sure of knowing the mean will be within ±0.1 mm? O1432 869 7572 23 38
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