Data are gathered on 16 students. Half of the students are randomly assigned to a new tutoring program, and half have their usual school experience.

Data are gathered on 16 students. Half of the students are randomly assigned to a new tutoring program, and half have their usual school experience. A study find that test scores for the tutoring program students are on average 10 points higher than those for the other students. The p value for a test of improvement from the program is 0.3 not significant at even the 10% level.

A. If mean test scores are 200 and the standard deviation is 40, are these results practically significant, in your opinion? Explain what practical significance means.

B. Explain what causes this result to be not statistically significant.

C. Do you conclude that the tutoring program is ineffective because the results are statistically significant?