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2. Aleading consumer magazine, The False Traders, claims that the small coffee sold at PHILZ coffee...

2. Aleading consumer magazine, The False Traders, claims that the small coffee sold at PHILZ coffee shop does not contain 12 ounces of coffee. A sample of 16 customers who purchased a small coffee yielded the following information: - a sample mean equal to 11.90 ounces and a sample standard deviation of 0.16 ounces.

a. Set up a 90% confidence interval for the true population mean?

b. At the 5% level, test the hypothesis whether the true mean is less than 12 ounces.

Math   Statistics-And-Probability   
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