Question

Dependent samples t-test

A researcher wonders whether there is a difference in weight following a vegan diet. The scores for a group of 10 students before (pre) and after (post) the implementation of the vegan diet are recorded:

Student	Pre ()	Post ()
1	156	146
2	170	145
3	130	125
4	136	114
5	128	110
6	115	110
7	138	116
8	145	130
9	164	150
10	150	120

Answer 1

I have used minitab software

Steps

1. Enter the data   
2. Stat-basic Statistics-paired t
3. 
4. options
5.   
6. ok-ok

output

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So as the p value is nearly 0.01 we can accept the null nypothesis ( that is we can say that "there is no difference in weight following a vegan diet") at only 99% confidence level.. But otherwise we would reject the null hypothesis(that is we can say "there is a difference in weight following a vegan diet") at 90% and 95% confidence level

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