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Flashcards in Biostats Deck (10)
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1

Chi Square Test

Binary data, 4 diff groups
- what is expected for certain box? = row total X column total / grand total

2

If Standard Deviation is 0?

All observations are the same

3

What is an ordinal variable?

Ranked

4

P < 0.05, what's the chances a mistake was made?

1/20

5

Data before/after with 1 group of participants?

Paired t-test

6

2 independent groups, continuous variable?

Unpaired t-test (with n-2 degrees of freedom)

7

Confidence Interval equation?

CI = X + or - Z (SE)
*95% CI for mean, then Z = 2 SD's
*99% CI for mean, then Z = 3 SD's

8

Power

P = 1 - beta

9

Type I error

Alpha: you Abserved a difference that didnt exist (rejected null when it is true)

10

Type II Error

Beta: you were Blinded by the truth (failure to reject null when alternative is true)