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The Consumer Reports article described in Exercise 52 continued their investigation of washing machines. One of the variables the article reported was "cycle time," the number of minutes it took each machine to wash a load of clothes. Among the machines rated good to excellent, the 98% confidence interval for the difference in means cycle time
(µTop - µFront) IS (-40, -22).
a) The endpoints of this confidence interval are negative numbers. What does that indicate?
b) What does the fact that the confidence interval does not contain 0 indicate?
c) If we use this confidence interval to test the hypothesis that µTop - µFront = 0, what's the corresponding alpha level?
Using the standard deviation estimate of 1.8 from her earlier analysis, how large a sample must she take if she wants the margin of error to be under 0.5 inch?
Post hoc tests when you have more than two groups on an IV (one-way ANOVA) - Main effects and interactions (factorial ANOVA), and Working with multivariate analyses of multiple DVs (one-way MANOVA).
In a large metropolitan area, past records revealed that 30 percent of all the high school graduates go to college. Each student's choice to go to college is independent. From 20 graduates selected at random, what is the probability that exactly 8 wi..
The sample resulted in a mean trading volume of > = 39.48. Assuming a population standard deviation of 15.07, compute the margin of error for a 95% confidence interval for mu.
Green versus yellow. Using the Minitab output in Figure 29.4, verify the values for the sample contrast 2 and its standard error given in Example 29.7. Give a 95% confidence interval for the population contrast L2.
The library governance committee also believes that the interaction B × C is important. Using an orthogonal array, set up an appropriate experimental design.
The graphic rating scale system is a very common approach to performance appraisal. It is simple to implement and to use, but tends to be very subjective. For instance, on a scale from 1 to 5 for a certain characteristic, 4 means good.
Years to Complete a Graduate Program: The average number of years a person takes to complete a graduate degree program is 3. The standard deviation is 4 months. Assume the variable is normally distributed. If an individual enrolls in the program, ..
Would you describe this distribution as symmetric or skewed? Explain.- Are there any outliers? Explain.- Create a boxplot of these data.
Suggest applications of nonparametric methods to solving business related problems. Describe the example. How are you or could you use nonparametric methods to solve business related problems?
If after one year, the annual mileage of privately owned cars is normally distributed with mean 14,000 miles and standard deviation 3,500, what is the probability that a car has mileage greater than 20,000 miles?
the life of a semiconductor laser at a constant power is normally distributed with a mean of 7000 hours and a standard
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