A trucking company is trying to decide whether to purchase brand A or brand B tires. An experiment is conducted to see how long the tires last until they wear out. 12 tires of each brand are tested. The results for brand A have a mean of 36,300 kilometers with a standard deviation of 5000 kilometers. The results for brand B have a mean of 38,100 kilometers with a standard deviation of 6100 kilometers. Find a 95 percent confidence interval for uA minus uB assuming the populations to be approximately normally distributed. You may not assume that the variances are equal. Report the lower confidence boundary to the nearest whole number. Report the upper confidence boundary from problem 5 to the nearest whole number A new missile system is being considered for deployment. The existing missile system has a 0.8 probability of success for a single run. A sample of 40 experimental runs is made with the new missile system, and 34 are successful. Construct a 95 percent confidence interval for p. Report the lower confidence boundary to the nearest 3 decimal places. Report the upper confidence boundary from problem 7 to the nearest 3 decimal places.
CI = x1 - x2
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