Directional manipulate the independent variables and then the dependent also will change because from its name wich dependent so it will change like the first one will change alsoo.It show us precise nature of relationship.
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Because the statistical test will compare the probability of the outcome under the null hypothesis in relation to the outcome under either a dierectional or non-directional alternative hypothesis.
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The s orbital is non directional.
We have two types of hypothesis i.e., Null Hypothesis and Alternative Hypothesis. we take null hypothesis as the same statement given in the problem. Alternative hypothesis is the statement that is complementary to null hypothesis. When our calculated value is less than the tabulated value, we accept null hypothesis otherwise we reject null hypothesis.
If we reject the null hypothesis, we conclude that the alternative hypothesis which is the alpha risk is true. The null hypothesis is used in statistics.