# BIOL132 - L8

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• Created by: Katherine
• Created on: 07-06-16 22:13
What are hypotheses?
Single tentative guesses, good hunches - assumed fr used in devising theory of planning experiments intended to be given a direct experimental possible.
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What is the nature of the hypothesis>
It can be tested - verifiable or falsifiable. Not moral or ethical questions. It is neither too specific nor too general. It is a prediction of consequences. It is considered valuable even if proven false.
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We have two types of hypotheses. What are these?
H0 (null) and H1 (alternative)
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What is the p value>?
The probability value - it represents the probability of two groups being different when in fact they are not. The smaller the p value the stronger the evidence that the observed difference is not by chance
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What do p values signify>
The likelihood that, given the null hypothesis is actually true, we see the observed or greater difference between means just by chance under andom sampling.
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With what data do we use a paramentric test?
Ratio or interval
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With what data do we use a non parametric test>
Ordinal or Nominal
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What is the central measure used for parametric tests?
Mean
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What is the central measure used for non parametric?
Median
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What are the benetifs of parametric tests?
Can draw more conclusion
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What are the benefits of non parametric tests?
Simplicity; less affected by outliers
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What s the correlation test used for paramentic?
Pearsons
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What is the correlation test used for non parametric?
Spearman
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When doing a paramentric test, using independent measures and 2 groups what test is used?
Independent measures t test
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When doing a non parametric independent measure, 2 group test, what test is used?
Mann whtney
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What if there are more than 2 groups for parametric?
One way, independent measure ANOVAA
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What about parametric, repeated measures, 2 conditions>
Matched pair t test
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Wilcoxon
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What is a parametric regression line?
We know the function that describes the relationship between the response and explanatory variables (e.g. linear models, generalized linear models)
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What is a non parametric regression line?
Used when the relationship between the response and explanatory variables is not known - when the relationship is not linear
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When is a t test used?
For difference between sample means. When we are testing whether one mean is bigger or smaller than the other, or for any difference.
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If we are are testing whether one treatment mean is bigger or smaller than the other we use a..
one tailed t test
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If we are testing for difference either way, we used a...
two tailed t test
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If using a one tailed t test, the convention would be
p
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When do we use a one tailed test?
When we test one of two outcomes.
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## Other cards in this set

### Card 2

#### Front

What is the nature of the hypothesis>

#### Back

It can be tested - verifiable or falsifiable. Not moral or ethical questions. It is neither too specific nor too general. It is a prediction of consequences. It is considered valuable even if proven false.

### Card 3

#### Front

We have two types of hypotheses. What are these?

### Card 4

#### Front

What is the p value>?

### Card 5

#### Front

What do p values signify>