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Since an hypothesis is a statement based on whether the independent variable will have an effect on the dependent variable, it is best to use the words if and then. Example: If water is added to a plant then it would grow.
OK, need to re-word that a bit due to restrictions on asking a question on this site. If only we could use commas and other characters."Is a hypothesis, the phrase immediately following the word 'then', called the hypothesis of a statement?"No, the phrase immediately following the word "then" is the conclusion. They hypothesis is the phrase following the word "if".However, answering the rest of the question, the hypothesis would be called the hypothesis of a statement.
You use a z test when you are testing a hypothesis that is using proportions You use a t test when you are testing a hypothesis that is using means
because Hypothesis itself is an assumption and we always use the term hypothesis only for assuming a perfect answer. so,we use mostly three forms,directional,non-directional and null hypothesis. it is a very simple and straightforward way to prove or make correct our hypothesis.