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Car Fuel Consumption
Listed below are the highway fuel consumption amounts (in mi/gal) from cars in three different categories. Use a 0.05 signifiacance level to test the claim that the different car categories have the same median highway fuel consumption. Based on the results, does the number of cylinders appear to affect highway fuel consumption?
Four cylinder
31 30 32 30 32 34 32 34 32 29 32 38 31
Six cylinder
26 29 29 27 27 25 25 30 37 32 31 27
Eight cylinder
25 25 25 27 25 25 25
(i) Test statistic H =
(ii) Critical value Χ^2 =
(iii) Conclusion on H0:
(iv) Interpret the results according to the problem.
Utilizing Excel data analysis calculate t distribution also deduce the result. Study of variance is used to investigate if there is a difference in the mean mileage of the three cars.
Find the maximum and minimum prices of the houses a contractor will build to include the middle 65% of the market.
Ace Jack had no idea whether the $100,000 he pays for training for his used car salespeople works.
Select the suitable hypothesis.H 0 : π ≥ .052; H 1 : π 0 if z
Is there any evidence that the different teatments produced different responses? If so, which one seems to work best?
where the deviations εi are assumed to be independent and Normally distributed with mean 0 and standard deviation σ. This model was fit to the data using the method of least squares. The following results were obtained from statistical software.
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A newspaper ad for a manager trainee position contained the statement "Our manager trainees have a first-year earnings average of $20,000 to $24,000." Do you think that the ad is describing a confidence interval? Explain your answer.
prevent coronary artery vasoconstriction and the attendant reduction in blood flow to the heart and mechanical function.
Prediction interval for the regression line - Using the age and sick days data from table below, find the 98% prediction interval when x = 47 years.
A population is normally distributed with the mean of 100 and a standard deviation of Would it be unusual for mean of sample of 3 to be 115 or more? Why or why not?
Suppose the population is normally distributed they make a decision to do a hypothesis test.
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