# Hypothesis Testing - Statistics How To

Im having a hard time answer a problem. The genetics and IV I situate conduct a clinical trial of the YOSORT method designed to increase the probability of a boy and 239 of them were Boyd’s. Use a 0.01 significance level to test the claim that the YOSORT method is effective in increasing the like hood that a baby will be a boy . I have to identify the null hypothesis, alternative hypothesis, test status is, p-value or critical value .

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A hypothesis is an educated guess about something in the world around you. It should be testable, either by experiment or observation. For example:

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If you are going to propose a hypothesis, it’s customary to write a statement. Your statement will look like this:
“If I…(do this to an )….then (this will happen to the ).”
For example:

Ten or so years ago, we believed that there were 9 planets in the solar system. Pluto was demoted as a planet in 2006. The null hypothesis of “Pluto is a planet” was replaced by “Pluto is not a planet.” Of course, rejecting the null hypothesis isn’t always that easy — the hard part is usually figuring out what your null hypothesis is in the first place.

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Next, you’ll need to state the null hypothesis (See: ). That’s what will happen if the researcher is wrong. In the above example, if the researcher is wrong then the recovery time is less than or equal to 8.2 weeks. In math, that’s:
H0 μ ≤ 8.2

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State the null hypothesis. In this case, the null hypothesis is that the population mean is 18.9, so we write:
H0: μ = 18.9

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for obese patients have a mean of 100 with a standard deviation of 15. A researcher thinks that a diet high in raw cornstarch will have a positive or negative effect on blood glucose levels. A sample of 30 patients who have tried the raw cornstarch diet have a mean glucose level of 140. Test the hypothesis that the raw cornstarch had an effect.

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The isn’t used very often (because we rarely know the actual population ). However, it’s a good idea to understand how it works as it’s one of the simplest tests you can perform in hypothesis testing. In English class you got to learn the basics (like grammar and spelling) before you could write a story; think of one sample z tests as the foundation for understanding more complex hypothesis testing. This page contains two hypothesis testing examples for .

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Sample problem: A sample of 200 people has a mean age of 21 with a population standard deviation (σ) of 5. Test the hypothesis that the population mean is 18.9 at α = 0.05.