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1. A safety engineer records the braking distance...




1. A safety engineer records the braking distance of two types of tires. Each randomly selected sample has 35 tires. The results of the test are at a= 0.10. Type A Type B _ _ X1 = 43 feet X2 = 45 feet S1 = 4.6 S2 = 4.5 feet Assume the sample are randomly selected and that the sample are independent. can the engineer support the claim that the identify the claim and state H0 and Ha mean braking distance is different for the two types of tires. a). what is the claim? b). What is the test statistic? c) what is critical value? d). The conclusion of the claim. 2. The table gas mileages in miles in miles per gallon of eight cans with and without a fuel additive. At a =0.10 is there enough evidence to conclude that the fuel additive improved gas mileage. Cars 1 2 3 4 5 6 7 8 Gas mileage without additive 22.3 24.3 24.3 21.6 21.1 22.9 25.7 20.9 Gas mileage with fuel additive 23.0 26.9 25.0 22.7 21.8 24.6 27.4 23.5 a). Identify claim and state H0 and Ha, b). Let ud be the hypothesized mean of the car's gas mileage without additive minus their gas mileage with additive. State the Ho and Ha. c) Find the critical values indentify the rejection region. d). calculate d and sd(3 decimal places). - d= sd= e). Use the t-test to find the standardized test statistic t= f). decide whether to reject or fail to reject the null. 3. Test the claim use the t-test for dependent random, samples at the given level of significance. Is the test right-tailed, left-tailed, two-tailed. assume the population are normally distributed. Claim ud


Paper#13463 | Written in 18-Jul-2015

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