The WISC scores of a sample of n = 20 5^th graders resulted in a mean of 104 with a standard deviation of 9. Is the mean score significantly higher than 100 when $\alpha$ = 0.05? A) No, because t = 1.99 which is greater than the critical value t* = 1.73. B) Yes, because t = 1.99 which is greater than the critical value t* = 1.73. C) No, because t = 1.99 which is smaller than the critical value t* = 2.09. D) Yes, because t = 1.99 which is smaller than the critical value t* = 2.09.

Question

Quizplus · Accepted Answer

The calculated t-value (1.99) is greater than the critical t-value (1.73) for a one-tailed test at $\alpha$ = 0.05 with 19 degrees of freedom, indicating the mean score is significantly higher than 100.

The WISC Scores of a Sample of N = 20 α\alphaα

The WISC Scores of a Sample of N = 20 $\alpha$