our teacher gave us a handout and sorta refuses to give us the solutions as always...our test is next week and no one is sure of the answers, help is much appreciated.
1) A food processor wants to compare two preservatives for their effects on retarding spoilage. Suppose 16 cuts of fresh meat are treated with preservative A and 16 are treated with preservative B, and the number of hours until the spoilage begins is recorded for each of the 32 cuts of meat. the results are summarized in the table below
b. Determine the rejection region at a=.05 and write the proper conclusion
c. Estimate the difference between the two population mean with 95% confidence.
2) a drug company has just developed a new pill to alleviate the symptoms of allergies and colds. However they are concerned about the variability in the amount of time until the drug becomes effective. in a random sample of 10 individuals who suffer from allergies, the amount of time (in hours) for the pill to take effect was recorded and listed as follows: 5, 7, 6, 10, 9, 12, 8, 17, 4, and 16, S2= 19.6 estimate with 90% confidence the variance of the time for the drug to become effective.
1) A food processor wants to compare two preservatives for their effects on retarding spoilage. Suppose 16 cuts of fresh meat are treated with preservative A and 16 are treated with preservative B, and the number of hours until the spoilage begins is recorded for each of the 32 cuts of meat. the results are summarized in the table below
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.................. preserv.A ...preserv.B
Sample mean 108.7 hours 98.7 hours
sample STDV 10.5 hours 13.6 hours
b. Determine the rejection region at a=.05 and write the proper conclusion
c. Estimate the difference between the two population mean with 95% confidence.
2) a drug company has just developed a new pill to alleviate the symptoms of allergies and colds. However they are concerned about the variability in the amount of time until the drug becomes effective. in a random sample of 10 individuals who suffer from allergies, the amount of time (in hours) for the pill to take effect was recorded and listed as follows: 5, 7, 6, 10, 9, 12, 8, 17, 4, and 16, S2= 19.6 estimate with 90% confidence the variance of the time for the drug to become effective.