Hi there,

I am having a hard time understanding the probability (p-value).

P(|x̄-66.7|>|68.442-66.7| | μ=66.7).

So the above probability is, difference between sample mean and 66.7 is greater than 1.742 given that H0 is true. But the thing is that, 66.7 is actually the sample mean, so x̄-66.7 should be 0. Because its the difference between sample mean and sample mean! Am I missing something? is x̄ something else? Isn’t 66.7 the sample mean? I am totally confused regarding this.