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In summer 2000, a growing number of warranty claims on Firestone tires sold on Ford SUVs prompted Firestone and Ford to issue a major recall. An analysis of warranty-claims data helped identify which models to recall. A breakdown of 2,504 warranty claims based on tire size is given in the following table:
Tire Size Warranty claims23575R15 2,030311050R15 13730950R15 8223570R16 81331250R15 5825570R16 54others 62
a. Construct a Pareto diagram for the numbers of warranty claims by tire size. What tire size accounts for most of the claims?
b. Construct a pie chart to display the percentage of the total numbers of warranty claims for the 23575R15 tires that come from the ATX model and wilderness model. Interpret the chart.
Final scores averaged 66 for the treatment group; the SD was 21. For the control group, the figures were 59 and 20. What do you conclude?
Graph the information using a histogram and a scatter plot in Excel as well. How does seeing the information in a graphical format provide more information?
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho = 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
Statistical Hypothesis test for the given sample
Compute the difference scores for following data from repeated-measures study.
Assuming the nurses surveyed were a random sample from the population of all nurses in the United States, we can use these data to test the null hypothesis H0 that there is no association between the row and column variables in this two-way table...
A transatlantic plane carries 140 passengers. It is known that the average weight of all passengers on that plane is 147.14 pounds, that the men on that plane weigh on the average 170 pounds, and women 130 pounds. How many men and how many women w..
The mean, median, and mode are the most common measures of dispersion (spread).
Does the overall data support the mayor's claim?
The Queen Mary sails between England and the U.S. Stowaways are sometimes found on board. The ages (years) of stowaways from eastbound and westbound crossings are given below. Eastbound: 24, 24, 34, 15, 19, 22, 18, 20, 20, 17 Westbound: 41, 24, 32..
A uniform probability distribution is a continuous probability distribution where the probability that the random variable assumes a value in any interval of equal length is.
Using symbols mention null hypothesis and alternative hypothesis.
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