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02-Feb-2020 15:19 by 3 Comments

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The process of biological sex differentiation (development of a given sex) involves many genetically regulated, hierarchical developmental steps.

The important thing to remember about stating hypotheses is that you formulate your prediction (directional or not), and then you formulate a second hypothesis that is mutually exclusive of the first and incorporates all possible alternative outcomes for that case.We can see that the term "one-tailed" refers to the tail of the distribution on the outcome variable. For instance, let's assume you are studying a new drug treatment for depression.The drug has gone through some initial animal trials, but has not yet been tested on humans.You believe (based on theory and the previous research) that the drug will have an effect, but you are not confident enough to hypothesize a direction and say the drug will reduce depression (after all, you've seen more than enough promising drug treatments come along that eventually were shown to have severe side effects that actually worsened symptoms).In this case, you might state the two hypotheses like this: The null hypothesis for this study is: The figure on the right illustrates this two-tailed prediction for this case.If your original prediction was not supported in the data, then you will accept the null hypothesis and reject the alternative.

The logic of hypothesis testing is based on these two basic principles: , and sometimes we just have to do things because they're traditions.

When your study analysis is completed, the idea is that you will have to choose between the two hypotheses.

If your prediction was correct, then you would (usually) reject the null hypothesis and accept the alternative.

And anyway, if all of this hypothesis testing was easy enough so anybody could understand it, how do you think statisticians would stay employed?

Similarly some females are also born 46XY due to mutations in the Y chromosome.

In addition, some males are born 46XX due to the translocation of a tiny section of the sex determining region of the Y chromosome.

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