Please answer the questions 38-45, thanks!!!! informarion regarding random sampl

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Please answer the questions 38-45, thanks!!!!

informarion regarding random samples of annual salaries (in thousands of dollars) of doctors in three diferent specialries is shown below Exhibit 8 Pediatrics Radiology Patholog 10 186 18 12 Sample size Average salary 12 Sample variance 16 240 20 38. Refer to Exhibit 8. Compute the overall mean J a 60 b. 546 c. 182 d. 180 Refer to Exhibit 8. The null hypothesis 39. H.: There is significant difference among the means of the populations. a. b. He: At least one mean is different from the others c. H. At least one mean is different from the others d. H.: There is no significant difference among the means o the populations. 40, The critical F value with 6 numerator and 60 denominator degrees of freedom at -.05 is a 3.12 b. 2.25 c. 2.63 d. 1.87 An ANOVA procedure is applied to data obtained from 6 samples where each sample contains 20 observations. The degrees of freedom for the critical value of F are a. 6 numerator and 20 denominator degrees of freedom b. 5 numerator and 20 denominator degrees of freedom c. 5 numerator and 114 denominator degrees of freedonm d. 6 numerator and 20 denominator degrees of freedom The mean square is the sum of squares divided by a the total number of observations b. its corresponding degrees of freedom c. its corresponding degrees of freedom minus one d. None of these alternatives is correct. The required condition for using an ANOVA procedure on data from several populations is that the a. the selected samples are dependent on each other b. sampled populations are all uniform c. sampled populations have equal variances d. sampled populations have equal means 4. 42. 44. Regression analysis is a statistical procedure for developing a mathematical equation that describes how a. one independent and one or more dependent variables are related b. several independent and several dependent variables are related one dependent and one or more independent variables are related d. c. None of these altermatives is correct. 45. In a simple regression analysis (where Y is a dependent and X an independent variable, if the Y intercept is positive, then a. there is a positive correlation between X and Y b. if X is increased, Y must also increase c. if Y is increased, X must also increase d. None of these alternatives is correct

Explanation / Answer

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38) Mean = (120 * 12 + 186 * 10 + 240 * 11)/33

Mean = 180

39) Null: D option

40) Critical F = 2.25

41) C option

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