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INTRODUCTION TO STATISTICS (PAM2100001LEWISFALL2009)
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ps 11
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We measure the amount of vitamin C in corn soy blend
(CSB). The population distribution is roughly normal. The
sample mean x_bar = 24 and the sample standard deviation s=
9. The sample size n= 14. Using this data, a 99% confidence
interval for the population mean amount of vitamin C is
constructed. What is the margin of error associated with this
confidence interval (rounded to three decimal places
)?
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You will have complete sales information for last month in a
week, but right now you have data from a random sample of 25
stores. The mean change in sales in the sample x_bar= 5 and the
standard deviation of the changes s = 11. The population
distribution is roughly normal. Here are the null and alternative
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 Spring '08
 ABDUS,S.

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