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In establishing warranty on TV sets the manufacturer wants to set the limits so that few will need repair at manufacturer expense. On the other hand, the warranty period must be long enough to make the purchase attractive to the buyer. For a new TV the mean number of months until repairs are needed is 36.84 with a standard deviation of 3.34 months. Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense? (Hint: Assume that the life (time in months until repair) of TV is normally distributed).
Find out the confidence interval for the population mean also interpret the result. A researcher is interested in whether social assertiveness might be influenced by training procedures.
Cores on two tests have a bivariate normal distribution; and that correlation of 2 scores is 0.8. Determine the probability that sum of the student's scores on 2 tests will be greater than 200?
From her district, consisting of several hundred stores, she selects a random sample of 30 stores. For each store she gathered the following information.
If 50 cups of coffee were measured, what is the probability that: The sample mean per cup is less than 7.8 ounces?
Evaluate the mean wait time and throughput rate
Using Analysis of Variance (ANOVA) test at 5% level if there are important differences in mean sales calls made across the three branches.
The nation health department has concerns with the chlorine level of 0.4% mg/mL at a local water park raises to unsafe level.
Construct a probability for the number of students in the sample who watch soap operas.
For the 20 test scores shown, find the percentile rank for a score of 86.
If alternate hypothesis mention that m doesn't equal 4,000, determine the rejection region for the hypothesis test?
Is there any evidence that the different teatments produced different responses? If so, which one seems to work best?
Make a scatter plot, illustrate the regression lines. Determine the correlation coefficient between husband’s and wife’s education for couples in which wife is employed full time?
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