In Wilcoxson signed rank test with n = 30, what is the expected value of the tes

Question

In Wilcoxson signed rank test with n = 30, what is the expected value of the test statistic when the null hypothesis is true? () A. 61 B. 232.5 C. 465 D. 930 In nested models, if your F test Is not significant, will you prefer the () A. Reduced model B Complete model C. Either one D. Neither one The researcher would like to predict the height of a shrub (y) based on the amount of bacteria In the soli (X_1, unit in 1000 bacteria count per ml) and whether the plant is located In partial or full sun (X_2 = 1 for full sun and x_2 = 0 for partial sun). If the fitted regression line is Height = 35 + 4.2 X_1 + 9 X_2 + 3.2 X_1 * X_2 For plants with full sun, on average, shrubs with a 3000 bacteria count would be () taller than those with a 2000 count For plants with partial sun, on average, shrubs with a 3000 bacteria count would be () taller than those with a 2000 count A. 7.4 B. 4.2 C. 3.2 D. 9

Explanation / Answer

3. n(n+1)/4 =232.5

4. Reduced model , if F is not suficient its means we donot reject the null hypothesis which is fill model contains addition information for model contribution .

5. 4.2

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