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Before you perform a statistical test, you have a null hypothesis H0 and alternative hypothsis Ha. Under the null hypothesis(H0, e.g., u=10), the test statistic has certain probability distribution(Normal, Chi square, t-distribution, F-distribuation, etc.), based on the data, you can calculate the test statistic(i.e. z, t, f, etc.), then you can determine reject region, you can look the corresponding distribution table, find out the probability for your test statistic. If p>0.05, that means you can not reject the null hypothesis(not significant). Otherwise, P<0.05, that means you need to reject Ho (e.g., u is not equal to 10). Note that there are type I error and type II error.
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