15. If the obtained value is greater than the critical value (as presented in a

Question

15. If the obtained value is greater than the critical value (as presented in a Table of Critical Values), what do you know? A. That the difference between the groups is statistically significant. B. That the difference between the groups is not statistically significant C. That the difference between the groups is due to chance and/or random error D. You have screwed up and must convince your boss it was not your fault! 16. Although our analysis found a statistically significant difference between the groups in question, what other point of reference can we use in making decisions regarding these differences? A. We can calculate Cohen's d B. We can determine Effect Size differences between the groups C. We can identify and determine practical significance D. All of the above 17. What does this mean: p >. 05? A. The differences between the groups in question are statistically significant. B. There is less than a 5% probability that the difference is due to chance C. There is greater than a 5% probability that the difference is due to chance D. The possibility of chance or random errors caused the difference is less than 5 in 100 18. If you obtained a t-value of 7.14, and the critical value is 6.10, what decision would you make? A. Accept the null hypothesis B. Reject the null hypothesis C. Rerun the analysis D. Use a one-tailed test 19. What is considered to be a small effect for a Cohen's d? A. .57 B. .58 D. .30

Explanation / Answer

ans 15) Option A-When the obtained value is greater than the critical value- that the difference between the groups is statistically significant.

ans 16)Option D. All of the above. Cohen's d-It is an effect size use to find out the standardized difference between two means.

and 17)Option C.There is a greater than 5%probability that the difference is due to chance and hence the data is not sufficient evidence.

and 18))Option B: Reject the null hypothesis. If the t-value is greater than the critical value.Our assumption is false and the experimental data is correct.

and 19))OPTION C: 0.17 IS considered to be a small effect for a cohen's d.05 is considered as medium effect size and 0.8 is considered as large effect size.

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