To test whether there is any different between mean tire-tread life due to drivi

Question

To test whether there is any different between mean tire-tread life due to driving conditions, fifteen similar cars were each driven under one of three conditions: city, highway, country. The tread wear was the determined for each car. The number of degree of freedom for the F-test is: In testing for gender difference in online clothing purchases, simple of 40 females and 40 males were surveyed to determine the percent of each who had made online clothing purchases in the last month. If 16% of females and 10% of males responded favorably, which statistical test should be used to test for the gender differences? A. A t-test with df = 78 B. a t-test with df = 39 C. An F-test D. A z-test. For the multiple regression equation y^= 93 + 26x_1 + 10x_2 - 12xx_3, if x_3 were to increase by 10, the estimated value of y would A. Increase by 10. B. increase by 120. C. Decrease by 120. D. Decrease by 12/120. When we wish to statistically test whether or not the mean of more than two population may be considered equal, we may use: A. Prediction intervals. B. simple linear regression. C. a chi-square test. D. Point estimates. E. Analysis of variances. When we wish to statistically test whether or not the properties of more than two population may be considered equal, we may use: A. Prediction intervals. B. simple linear regression. C. a chi-square test. D. Point estimates. E. Analysis of variances. The area to the right of a square value is 0.05. For 5 degrees of freedom. The table value is: A. 9.236 B. 9.488 C. 11.070 D. 11.43 E. 12.833. The area to the right of z-value is 0.10. The table value is: A. 1.1282 B. 1.645 C. 196 D. 2.326 W. 2. 576 The are to the right of a t-value is 0.05. For 1- degree freedom, the table value is A. 1.372 B. 1.812 C. 1.645 D. 1.833 E. 2.228

Explanation / Answer

26)option C is correct

27)option D is correct

28)option C is correct

29)option D is correct

30)option C is correct

31)option C is correct

32)option A is correct

33)option E is correct

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