Statistics: T-test Hypothesis Testing – #28665


Question: In the following experiment the researcher was interested in the side effects of radiation therapy on patents suffering cancerous lesions. In particular he was interested in the effect of radiation therapy on Mental dexterity. Each patient was scored (Pre test) on a mental dexterity test prior to treatment. They were again scored on a similar test (Post Test) one month after treatment began.

N1 = 16 were not given radiation and served as controls,

N2 = 19 were given radiation dosage in the range 25-50,

N3 = 18 were given radiation dosage in the range 75-100, and

N4 = 21 were given radiation dosage in the range 125-250.

The data were tabulated below:

Pre test Post Test Treat
72 74 Control
58 57 Control
66 74 Control
51 56 Control
30 28 Control
48 40 Control
58 61 Control
51 50 Control
38 40 Control
56 56 Control
68 72 Control
36 38 Control
53 53 Control
65 72 Control
32 24 Control
64 62 Control
58 55 25-50 R
58 57 25-50 R
56 57 25-50 R
73 59 25-50 R
49 42 25-50 R
53 49 25-50 R
28 29 25-50 R
31 43 25-50 R
23 29 25-50 R
61 62 25-50 R
40 37 25-50 R
57 59 25-50 R
38 48 25-50 R
77 79 25-50 R
69 64 25-50 R
72 67 25-50 R
50 46 25-50 R
49 49 25-50 R
51 46 25-50 R
23 16 75-100 R
60 51 75-100 R
54 43 75-100 R
48 40 75-100 R
45 35 75-100 R
37 31 75-100 R
50 48 75-100 R
44 31 75-100 R
39 31 75-100 R
57 46 75-100 R
26 14 75-100 R
50 54 75-100 R
47 41 75-100 R
43 30 75-100 R
41 30 75-100 R
45 44 75-100 R
68 69 75-100 R
62 35 75-100 R
64 51 125-250 R
42 26 125-250 R
52 35 125-250 R
47 27 125-250 R
53 40 125-250 R
65 50 125-250 R
67 46 125-250 R
32 25 125-250 R
77 58 125-250 R
32 24 125-250 R
58 45 125-250 R
46 32 125-250 R
45 30 125-250 R
74 68 125-250 R
41 17 125-250 R
46 29 125-250 R
39 20 125-250 R
61 38 125-250 R
50 33 125-250 R
29 12 125-250 R
72 54 125-250 R
38 23 125-250 R

Analyze this data stating your conclusions

only-members
 

log in

reset password

Back to
log in