Question

A student wants to assess whether her remedial tutoring has been effective for her five students. She decides to conduct a related samples t-test and records the following grades for students prior to and after receiving her tutoring.

Tutoring
Before	After
2.4	3.1
2.5	2.9
3.0	3.6
2.9	3.1
2.7	3.5

(a) Test whether or not her tutoring is effective at a 0.05 level of significance. State the value of the test statistic. (Round your answer to three decimal places.)
t =

(b) Compute effect size using estimated Cohen's d. (Round your answer to two decimal places.)
d =

Answer 1

from above t =-5.014

since p value <0.05 , tutoring is effective at a 0.05 level of significance

reject the null

b) Cohen's d. =|dbar|sd = -0.54/0.241=2.24