My Notes Ask Your Teacher A statistics instructor measured student attitudes tow

Question

My Notes Ask Your Teacher A statistics instructor measured student attitudes toward a statistics course prior to lectures, at the midterm, and after the final exam. Attitudes were measured on a 16-point scale, with higher scores indicating more positive attitudes toward the statistics course 18. 1/2 points| Previous Answers PriviteraStats2 18.E.027 At the After the Prior to Student Lectures Final 12 15 13 15 9 6 9 12 13 12 Based on the results shown in the table, test whether or not attitudes differed using the Friedman test at a 0.05 level of significance. (Round your answer to two decimal places.)

Explanation / Answer

THe table is given below

XR2 = 32.4

The assigned values here are in ascending order

XR2 = 12/ (nk (k+1) R2 - 3n(k+1)

where n = 5 , k = 3 and R2 = 36 + 81 + 225 = 342

XR2 = 12 * 342/ (5 * 3 *4) - 3 * 5 * 4 = 8.4

p - value = CHIDIST (8.4,2) = 0.015

significance level = yes

Student Prior to lecures At the Midterm After the final A 2 1 3 R^2 342 B 1 2 3 k 3 C 1 2 3 m 5 D 1 2 3 Q 8.4 F 1 2 3 df 2 Sum 6 9 15 p 0.01499558 Sum2 36 81 225 342 alpha 0.05 sig yes

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