Question

Difference of two Means. A national testing agency decided to do an experiment to see about the value of using a computer in a mathematics class. One group of students (Group A) used a computer in their class, while another group (Group B) did not. The main variable of interest was a test score, and we want to see if the mean test score for Group A is Larger than Group B. Use alpha = .05 for your test.

The sample statistics are given below for each group.

	Group A	Group B
Mean Score	320	302
Standard Deviation	29.5	32.1
N	20	20

We can assume the two variances are equal. What is the pooled Standard Error for this problem? Just give an answer. Use 4 decimal places and use the proper rules of rounding.

Answer 1

SP nl n2- 2

ja-1) x 29.52 2020-1) × 32.12 = 30.8274 20 +

$SE=s_{P}\sqrt{1/n1+1/n2}$

30.8274 V/1/20+ 1 /20 9.7485

So,

Answer is:

9.7485