research using a statistical hypothesis, ..
In statistics, during a statistical survey or a research, a hypothesis has to be set and defined
Statistical hypothesis testing - Wikipedia
In order to undertake hypothesis testing you need to express your research hypothesis as a null and alternative hypothesis. The null hypothesis and alternative hypothesis are statements regarding the differences or effects that occur in the population. You will use your sample to test which statement (i.e., the null hypothesis or alternative hypothesis) is most likely (although technically, you test the evidence against the null hypothesis). So, with respect to our teaching example, the null and alternative hypothesis will reflect statements about all statistics students on graduate management courses.
In other words, we simply take out the word "positive", which implies the direction of our effect. In our example, making a two-tailed prediction may seem strange. After all, it would be logical to expect that "extra" tuition (going to seminar classes as well as lectures) would either have a positive effect on students' performance or no effect at all, but certainly not a negative effect. However, this is just our opinion (and hope) and certainly does not mean that we will get the effect we expect. Generally speaking, making a one-tail prediction (i.e., and testing for it this way) is frowned upon as it usually reflects the hope of a researcher rather than any certainty that it will happen. Notable exceptions to this rule are when there is only one possible way in which a change could occur. This can happen, for example, when biological activity/presence in measured. That is, a protein might be "dormant" and the stimulus you are using can only possibly "wake it up" (i.e., it cannot possibly reduce the activity of a "dormant" protein). In addition, for some statistical tests, one-tailed tests are not possible.
Hypothesis in Qualitative Research - ResearchGate
The distinction between independent groups and same subject designs is important since different statistical tests are used for hypothesis testing. In general, same subject research designs have more statistical power since there are fewer sources of variation in the experiment. Note that a randomized controlled trial (RCT), the golden standard of clinical trials, combines both design types by having pre and post measures for both a control and treatment group.
At the heart of research lies a question. For example, consider the following scenario: you just went for a run in the park, and you feel great. Naturally, you might ask yourself "does exercise make people happy?". If you are asking a question that you don't know the answer to, research is necessary to resolve it. There are many forms that this research can take, from a literature review to performing an experiment. A technique known as statistical hypothesis testing is often used in psychology to determine a likely answer to a research question.
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Hypothesis - Wikipedia
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