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15 Cards in this Set
- Front
- Back
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Why do we have statistics?
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Make accurate (absolute) statements about data
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What percent of the p value is acceptable?
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5%
.05 |
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p-value
what are the two values p can be |
probability that your data is in the <5% range
.05% or .01% |
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In science you....
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DISPROVE THINGS! NOT prove
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Two types of hypotheses
examples of both |
1. null (Ho)- expected
randomness 2.Alternate (H1)- what you are trying to test Null- survival will be random Alternate- 25% of fish will survive |
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Chi-Square Test. Which type?
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goodness of fit
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Chi-square test equation
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x^2= sum of (obs-exp)^2/ exp
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Must calculate degrees of freedom how?
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# of categories - 1
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Decision Rule
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If x^2 > critical value, you REJECT the null
if x^2 < critical value, you fail to reject the null hypo |
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IF x^2 is very large than..
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your expected values are not very close to your observed values
and vice versa |
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monohybrid cross
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heterozygous for the one gene in question
Rr x Rr 3:1 |
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dihybrid cross
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mating between parents that are both heterozygous for two trats
RrSs x RrSs 9:3:3:1 |
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Test cross
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rrss x RrSs
1:1:1:1 |
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Mutually exclusive events
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OR
find probability of each and than ADD them |
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independent events
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AND
find probability of each and MULTIPLY them |
