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. (Round your answer to two decimal places.)
z =  

State whether to retain or reject the null hypothesis. (Assume alpha equal to 0.05.)

Retain the null hypothesis.

Reject the null hypothesis.    

with microsoft powerpoint without microsoft powerpoint 5 18 23 10 13 8 12 19 6 7 4 14 11 21 9 15

Explanation / Answer

The U-value is 19. The critical value of U at p < .05 is 13. Therefore, the result is not significant at p < .05.

The Z-Score is -1.31276. The p-value is .1902. The result is not significant at p < .05.

p-value is less than 0.05, we reject the null hypothesis that there's no difference between the means and conclude that asignificant difference does exist. .

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