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18 Cards in this Set
- Front
- Back
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Is blocking random or not random? |
Not random |
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What is the least squares regression line formula ? |
^ Y = a+bx |
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What is the formula for slope of a regression line? |
b= r( Sy/Sx)
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What is r^2? |
Coefficient of determination. Determines fraction of variance that is explained by regression model |
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What is a lurking variable? |
Variable that isn't among the explanatory or response variables in a study. |
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Why are two variable confounded? |
When their effects on a response variable can't be distinguished from eachother. |
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What is a simple random sample? |
Made of randomly selected individuals. Each individual in the population has the same probability of being in the sample. |
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Case control stufy |
2 different samples of individuals with different outcomes, look for exposure facts in subjects past. |
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Cohort studies |
Individuals of common demographic and keep track of them over a long period of time. |
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Block design |
Subjects are divided into blocks before randomization in order to account for possible differences between blocks. |
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Matched pair designs |
Choose pairs of subjects that are closely matched. Within each pair randomly assign who will receive which treatment. |
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What are the odds if an event occurring? |
P/1-p P(A)=p odds of A= P/1-p |
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What is the 68-95-99.7 rule? |
68% of all observations lie within one S.D. 95% of all observations lie within 2 S.D. 99.7% of all observations lie within 3 S.D. |
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How do you standardize X? |
z= x-mean/S.D |
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What is stratified analysis |
Blocking |
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Probability of a certain x on a continuous model is |
0 |
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The response variable is |
Dependent (y) |
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The explanatory variable is |
Independent (x) |
