Question

Loss of hearing can be a significant problem for older adults. Although hearing aids can correct the physical problem, people who have lived a hearing impairment often develop poor communication strategies and social skills. To address this problem, a home education program has been developed to help people who are receiving hearing aids for the first time. The program emphasizes communication skills. To evaluate the program, overall life satisfaction was measured before treatment, again at the end of the training program, and once more at a 6 month follow-up. Data similar to the results obtained in the study are shown below. The higher the number, the greater the life satisfaction reported by the subjects. Do the data indicate a significant improvement in quality of life following the program? Test at the .05 significant level.

Subjects:          Before             After                6 months later

A 3                      7                      8

B 0                      5                      7

C 4                      9                      5

D 1                      7                      4         

1. Show all sums necessary for calculations
2. What are critical values for F and HSD at both .05 and .01 levels of the alpha
3. What is the Independent and Dependent Variable - label each
4. Complete the ANOVA summary table (worth 7 points). Must show calculation for each for credit

Answer 1

Before	After	6 months later
3	7	8
0	5	7
4	9	5
1	7	4
	Mean	n	Std. Dev
	2.0	4	1.83	Before
	7.0	4	1.63	After
	6.0	4	1.83	6 months later
	5.0	12	2.76	Total
ANOVA table
Source	SS	df	MS	F	p-value	F critical value
Treatment	56.00	2	28.000	9.00	.0071	4.26
Error	28.00	9	3.111
Total	84.00	11

The dependent variable is quality of life and the independent variable is the program.

Source	SS	df	MS	F	p-value
Treatment	56.00	2	28.000	9.00	.0071
Error	28.00	9	3.111
Total	84.00	11