# Which of the following would be an appropriate null hypothesis

A Bayesian would insist that you put in numbers just how likely you think the null hypothesis and various values of the alternative hypothesis are, before you do the experiment, and I'm not sure how that is supposed to work in practice for most experimental biology. But the general concept is a valuable one: as Carl Sagan summarized it, "Extraordinary claims require extraordinary evidence."

## Alternative hypothesis - Wikipedia

### Chapter 8 and 9 BB Flashcards | Quizlet

The alternative hypothesis is that things are different from each other, or different from a theoretical expectation. For example, one alternative hypothesis would be that male chickens have a different average foot size than female chickens; another would be that the sex ratio is different from 1:1.

### Start studying Chapter 8 and 9 BB

Usually, the null hypothesis is boring and the alternative hypothesis is interesting. For example, let's say you feed chocolate to a bunch of chickens, then look at the sex ratio in their offspring. If you get more females than males, it would be a tremendously exciting discovery: it would be a fundamental discovery about the mechanism of sex determination, female chickens are more valuable than male chickens in egg-laying breeds, and you'd be able to publish your result in *Science* or *Nature*. Lots of people have spent a lot of time and money trying to change the sex ratio in chickens, and if you're successful, you'll be rich and famous. But if the chocolate doesn't change the sex ratio, it would be an extremely boring result, and you'd have a hard time getting it published in the *Eastern Delaware Journal of Chickenology*. It's therefore tempting to look for patterns in your data that support the exciting alternative hypothesis. For example, you might look at 48 offspring of chocolate-fed chickens and see 31 females and only 17 males. This looks promising, but before you get all happy and start buying formal wear for the Nobel Prize ceremony, you need to ask "What's the probability of getting a deviation from the null expectation that large, just by chance, if the boring null hypothesis is really true?" Only when that probability is low can you reject the null hypothesis. The goal of statistical hypothesis testing is to estimate the probability of getting your observed results under the null hypothesis.

## How to Test Hypotheses - Statistics and Probability

The appropriate critical value will be selected from the t distribution again depending on the specific alternative hypothesis and the level of significance.

## Teaching Appropriate Behavior - Project IDEAL

This can be tested using the Hausman test and the test can be performed in STATA as follows:Null hypothesis: Random effect model is appropriate.Alternative hypothesis: Fixed effect model is appropriateNow, to testAfter running the hausman test if the p value is significant at 5% then we have to reject the null hypothesis and accept the alternative hypothesis i.e we should use the fixed effect in our model.