eM1 – Principles of hypothesis testing Flashcards Preview

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Flashcards in eM1 – Principles of hypothesis testing Deck (12)
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1

What is a research question?

Provides the frame for which every component of a research project refers back to - everything read experimented and discussed must link back to it

2

What is a hypothesis?

A prediction of what the answer to a research question may be

3

How do we test the validity of a hypothesis

Carefully chosen statistical tests

4

What is a null hypothesis?

A prediction that there is no dependant relationship between two variables

5

What is an alternative hypothesis?

A prediction that there is a specific and reproducible (dependant) relationship between variables

6

Why in clinical practice would you prefer a non directional hypothesis?

In case you miss an effect from what you're testing

7

What is important to remember about testing the validity of null hypotheses?

Can only reject or fail to reject chosen null hypothesis- answer is most likely correct but isn't 100% conclusive

8

What is a p-value?

The likelihood that the observed difference was observed by chance

9

What is the significance of a p-value?

Calculates the probability that the observed results are real - the probability of the results of the study reflecting what would be observed in the population.

10

What is the alpha (a)-value?

The probability of rejecting the null hypothesis when it's true.

11

At what a-value do most consider the p-value to show a significant difference?

p ≤ a = 0.05

12

When do we reject the null hypothesis?

p ≤ 0.05