3. A psychology instructor asked each student to report the number of hours he o

Question

3. A psychology instructor asked each student to report the number of hours he or she had spent preparing for the final exam. In addition, the instructor recorded the number of incorrect answers on each student' s exam. Hours Number Wrong 12 Based on the data presented above, and using all four steps of hypothesis testing, what conclusions can the instructor draw ? Use ? = 0.05 State the appropriate statistical test Ho: Hi: df (if appropriate) Critical value: State Results, Decision, and Conclusions:

Explanation / Answer

We have to test Is relationship between Hours and Number wrong.

The appropriate statistical test is Correlation coefficient test

H0: There is no relationship between Hours and Number wrong.

H1: There is a relationship between Hours and Number wrong.

Sample size = n = 5

Degrees of freedom ( df) = n - 2 = 5 - 2 = 3

Correlation coefficient = r = - 0.5880 ( Using excel =CORREL(Hours , Number wrong))

Critical value = 0.878 ( Using pearson table)

| r | < critical value we fail to reject null hypothesis.

Conclusion: There is no relationship between Hours and Number wrong.

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