If the P-value for a particular test statistic is 0.31, she expects results at least as extreme as the test statistic in about 31 of 100 samples provided the null hypothesis is true. As this event is not unusual, she will not reject the null hypothesis.
A hypothesis predicts the result of the research. It is an assumption that is based on some evidence. A hypothesis plays a crucial role in testing the significance of differences in experiments and between observations. Null means that have no value i.e. zero. In statistics, the null hypothesis is a type of hypothesis that suggests that no statistical relationship and significance exist in a set of given observations.
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