To study the effect of classroom size on students’ course evaluations, a researc

Question

To study the effect of classroom size on students’ course evaluations, a researcher randomly assigned 20 college students to one of two sections of the same course taught by the same instructor: a large class (50+) and a small class (under 25).The following course evaluations –on a four-point scale with 1 being the lowest score and 4 being the highest possible score were obtained at the end of the semester.Note these score indicate interval/ratio level data.(10 Points)

Large Class

Small Class

3

4

3

2

1

3

4

3

2

4

1

4

2

3

3

3

4

3

3

4

Levene's Test for Equality of Variances

F

Sig.

t

df

Sig. (2-tailed)

Mean Difference

Std. Error Difference

95% Confidence Interval of the Difference

Lower

Upper

Evaluation

Equal variances assumed

2.546

.128

-1.744

18

.098

-.70000

.40139

-1.54328

.14328

Equal variances not assumed

-1.744

15.142

.101

-.70000

.40139

-1.55484

.15484

Which statistical procedure has been applied to determine whether a significant difference exists between large and small classes with respect to course evaluations? ____________(be specific)

Are the results significant?How do you know this? __________________

Large Class

Small Class

3

4

3

2

1

3

4

3

2

4

1

4

2

3

3

3

4

3

3

4

Explanation / Answer

Result:

Which statistical procedure has been applied to determine whether a significant difference exists between large and small classes with respect to course evaluations? ____________(be specific)

Independent sample t test was used to compare between large and small classes with respect to course evaluations.

Are the results significant?How do you know this? __________________

The calculated t= -1.744, P=0.098 which is > 0.05 level of significance. The null hypothesis is not rejected. The results are not significant.

We conclude with 0.05 level of significance, that there is no mean difference between large and small classes with respect to course evaluations.

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