The weight of 6 persons before they stopped smoking and 7 weeks after they stopped smoking are as follows

Persons

1

2

3

4

5

6

7

8

Before

148

176

153

118

120

140

145

130

After

154

176

150

120

130

150

140

125

Use the t-test for paired observations to test the hypothesis at 0.05 level of significance that giving up smoking has no effect on a person's weight.