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# \$35.00Statistics course need help ASAP

• From Mathematics: Statistics
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• Due on Jun. 23, 2012
• Asked on Jun. 22, 2012 at 06:00:49AM

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SECTION 9.1

Retail Milk Prices: To estimate the national average retail price for a gallon of reduced- fat(2%) milk, an economist surveys stores in 20 cities from across the united states and obtains the following data

 4.16 4.02 3.77 3.05 3.66 3.79 4.16 3.88 3.29 4.02 4.29 3.74 4.35 4.05 3.72 3.66 2.69 3.22 2.96 4.06

Treat these data as a simple random sample of 20 retail prices and answer the following questions, assuming that o= \$0.46.

(a)    Use the data to compute a point estimate for the population mean retail price.

(b)   Because the sample size is small, we must verify that the price is approximately normally distributed and that the sample does not contain any outliers. The normal probability and boxplot are shown next. Are the conditions for constructing a Z-interval satisfied?

(c)    Construct a 95% confidence interval for the mean price of reduced fat milk. Interpret the interval.

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