A manufacturer of salad dressings uses machines to dispense liquid ingredients into bottles that move along a filling line. The machine that dispenses dressings is working properly when 8 ounces are dispensed. The standard deviation of the process is 0.15 ounces. Suppose that the average amount dispensed in a particular sample of 50 bottles is 7.952 ounces. Develop a 99 confidence interval around this sample mean.
Question 2
From a community of 80 homes, the EPA took a random sample and found the presence of lead in the tap water. In the 10 homes sampled, the average lead content was 12 parts per billion with s = 5 pts/billion. Construct a 99 confidence interval estimate for the population mean. ___________________ _ to ___________________ _ Do you feel that the homes exceed the EPA recommended maximum of 15 pts/billion? Explain your answer.
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