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What do you mean when you reject a hypothesis on the basis of sample?
alternitive hypothesis
Why is important that a sample be random and representative when conducting hypothesis testing?
It helps you nawser
What is hypothesis of difference?
The alternativehypothesis (Ha or H1) describes the population parameters that the sample data represent, if the predicted relationship exists. It is always the hypothesis of difference. That is as opposed to the null hypothesis (H0) that describes the population parameters that the sample data represent if the predicted relationship does not exist. See Basic Statistics of the Behavioral Sciences by Heiman.
What role does Random Sampling Distribution in hypothesis testing?
It is an assumption to hypothesis testing. I can not comment on the significance of a violation of these assumptions without knowing how the non-random sample was taken.
When the observed sample mean is close to expected population mean what do you in terms of the null hypothesis?
It depends on whether the hypothesis concerns the mean or the standard error (or variance) or something else.
