To lest whether there is any difference between mean tire-tread life due to driv

Question

To lest whether there is any difference 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 then determined for each car. The number of degrees of freedom for the F-test is: In testing for gender differences in online clothing purchases, samples 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 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, +10x_2 - 12x_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 means of more than two populations 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 variance. When we wish to statistically test whether or not the proportions of more than two populations 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 variance. The area to the right of a chi-square value is 0.05. For 5 degrees of freedom, the table value is: A. 9.236 B. 9.488 C. 11.070 D. 11.143 E. 12.833 The area to the right of a z-value is 0.10. The table value is: A. 1.282 B. 1.645 C. 1.96 D. 2.326 E. 2.576 The area to the right of a t-value is 0.05. For 10 degrees of 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) estimate change in Y =-12*10=-120

therefore option C

29)option E is correct

30)option C is correct

31)option C is correct

32) option A is correct

33) option B is correct

please revert if you are facing any problem with any of above in how to calculate it,

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