1:
Here we have paired data so sample size will be
n=7
The degree of freedom is
df=n-1=6
2:
First we need to fins the mean and SD of data set. Following table shows the calculations:
X | (X-mean)^2 | |
22 | 4 | |
24 | 0 | |
20 | 16 | |
26 | 4 | |
27 | 9 | |
25 | 1 | |
Total | 144 | 34 |
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