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In a sample of 41 Winnipeg adults aged 18-24 who celebrate Halloween, the mean amount spent...

In a sample of 41 Winnipeg adults aged 18-24 who celebrate Halloween, the mean amount spent on a costume was $35.45 with a standard deviation of $14.95.

a) Find the margin of error for a 95% confidence interval for the true average amount spent on a costume. Use your T-table to do this and round to the four decimal places.

B)  We are 95% confident that the true average amount spent on a Halloween costume for Winnipeg adults aged 18-21 is between ? and ?. (Give your values to four decimal places.)

Math   Statistics-And-Probability   
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