Is there a significant difference in the gasoline mileage of a car for regular unleaded and premium unleaded? To test this question, a researcher randomly selected 15 drivers for a study. They were to drive their cars for one month on regular unleaded and for one month on premium unleaded gasoline. The participants drove their own cars for this experiment. The average sample difference was 2.85 miles per gallon in favor of the premium unleaded, and the sample standard deviation of difference was 1.9 miles per gallon. For α = .01, does the test show enough evidence for the researcher to conclude that there is a significant difference in mileage between regular unleaded and premium unleaded gasoline? Assume the differences in gasoline mileage figures are normally distributed in the population.
Answer to relevant QuestionsUsing the given sample information, test the following hypotheses. a. H0: p1 – p2 = 0.......Ha: p1 – p2 ≠ 0Sample 1 .... Sample 2n1 = 368 ... n2 = 405x1= 175 ... x2 = 182Let α = .05. x is the number in the sample ...A large production facility uses two machines to produce a key part for its main product. Inspectors have expressed concern about the quality of the finished product. Quality control investigation has revealed that the key ...One recent study showed that the average annual amount spent by an East Coast household on frankfurters was $23.84 compared with an average of $19.83 for West Coast households. Suppose a random sample of 11 East Coast ...Test the following hypotheses by using the given data and alpha equal to .05.H0: p1 - p2 = 0Ha: p1 - p2 ≠ 0Sample 1 .. Sample 2n1 = 783 .... n2 = 896x1 = 345 .... x2 = 421A tree nursery has been experimenting with fertilizer to increase the growth of seedlings. A sample of 35 two-year-old pine trees is grown for three more years with a cake of fertilizer buried in the soil near the trees’ ...
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