# BIOL132 - L5

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• Created by: Katherine
• Created on: 07-06-16 20:20
What do we do in science?
Formulate a decision between two or more hypotheses.
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What is a null hypothesis?
The mean hight of 2 year old jamaican boys in 86.5cm.
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What is an alternative hypothesis?
The mean height of 2 year old jamaican boys is not 86.5cm
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What do we do to pro/disprove hyptoheses?
Start by assuming H0. Find evidence againtt H0, If enough evidence, refute H0 and conclude HA.
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How do we calculate the Cl?
Mean +- 1.96 x SE
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What is the SE?
It is S/Square root of (n)
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When is a p value a 2 tailed test?
Ahen a sample statistic is compared agaisnt a null hypothesis
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What is the p-value?
It is the measure of strength of evidence against H0.
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When is a p value a one tailed test?
When we are restricted to a directional question. E.g. are Jamaican boys shorter than british boys.
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What does a p value do?
It gives the probability of observing a statistic at least as extreme as the one you have calculated asuming H0 is true.
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The smaller the p value, the...
greater the evidence against the null hypothesis
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How should a p value be judged?
In the context of the experiment, the statistic of interest, the hypotheses a significance level.
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## Other cards in this set

### Card 2

#### Front

What is a null hypothesis?

#### Back

The mean hight of 2 year old jamaican boys in 86.5cm.

### Card 3

#### Front

What is an alternative hypothesis?

### Card 4

#### Front

What do we do to pro/disprove hyptoheses?

### Card 5

#### Front

How do we calculate the Cl?