Overweight people often become desperate because they different diets without success. Sara, a nutritionist wishes to test the efficiency of one –month diet program being undertaken by 7 candidates .she recorded their weights at the start and end of the program .the result is shown as bellow
S.NO
Before
After
1
68
65.5
2
78
74.2
3
95
90.1
4
85
80.3
5
69
66.3
6
64
61.9
7
73
70.1
At α=0.02 to test the efficiency of the diet program. Assume normal distribution for the paired difference