A professor has a teaching assistant record the amount of time (in minutes) that

Question

A professor has a teaching assistant record the amount of time (in minutes) that a sample of 16 students engaged in an active discussion. The assistant observed 8 students in a class who used a slide show presentation and 8 students in a class who did not use a slide show presentation. Use the normal approximation for the Mann-Whitney U test to analyze the data above. () z = State whether to retain or reject the null hypothesis. (Assume alpha equal to 0.05.) Retain the null hypothesis. Reject the null hypothesis. You may need to use the appropriate table in Appendix B to answer this question. 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. 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. ()

Explanation / Answer

Wilcoxon rank sum test with continuity correction

data: x and y
W = 18, p-value = 0.07797
alternative hypothesis: true location shift is less than 0

test statistics z = 18

and p-value is =0.077

hence we retain null hypothesis

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