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J.D. Power and Associates' annual customer- satisfaction survey, the Automotive Performance, Execution and Layout (APEAL) StudySM, in its 13th year, was released on September 22, 2008. The study measures owners' satisfaction with the design, content, layout, and performance of their new vehicles. A file entitled APEAL2 contains the satisfaction ratings for 2008 for each make of car.
a. Construct a histogram that starts at 710 and has class widths of 20 for the APThe study measures owners' satisfaction with the design, content, layout, and performance of their new vehicles. A file entitled APEAL2 contains the satisfaction ratings for 2008 for each make of car.EAL ratings.
b. The past industry average APEAL rating was 866 for 2005. What does the 2008 data suggest in terms of the relative satisfaction with the 2008 models?
supplier on-time delivery performance is critical to enabling the buyer? organization to meet its customer service
Add line-of-best fit (trend line/linear regression line) to your scatterplot. Write down the equation of the trend line below.
the inside diameter of a randomly selected piston ring is a random variable with mean value 12 cm and standard
R.C. Geary wrote some 70 years ago that "Normality is a myth. There never was, is, nor will there ever be a Normal distribution".
A random sample of the lifetime of 49 UltraIllum light bulbs has a mean of 3,960 hours and a standard deviation of 200 hours. Construct a 95% confidence interval estimate of the mean lifetime for all UltraIllum light bulbs.
Can you use the usual algorithms for addition and subtraction without treating zero as a number? Explain.
records indicate that on average 3.2 breakdowns per day occur on an urban highway during the morning rush hour.
For the sample of 32 lg us cities the correlation between the mean # of sq ft per office worker and the mean monthly rental rate in the central business district is the -.363 at the .05 significance level
Pollsters attempt to find out whether or not person is a "likely voter" before they count their opinion in poll. If we suppose 40% of registered voters will really vote.
The following data represent the service charge for direct-deposit customers if a customer's account falls below the minimum required $1,500 balance for a sample of 26 banks.
1. the instructor in a humanities class says that students have a 15 probability of making an a in her class 20
What proportion of observed variation in hardness can be explained by the simple linear regression model relationship between hardness and elapsed time? (Give the answer to three decimal places.)
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