Variance of the population will be 8 / 3
Write down all possible samples of size two, chosen by simple random sampling.
M1 = {22, 24}, M1 = {22, 26}, M1 = {24, 26}
Now we have to calculate the variance of the population:-
u = 22 + 24 + 26 / 3
α² = (484 + 576 + 676 / 3 ) - 576
= 8 / 3
For finding the 0 in the confidence interval we should know that If our confidence interval for a correlation or regression includes zero, that means that if you run your experiment again there is a good chance of finding no correlation in your data.
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