statistics

Question 1

What 2 values vary w/disease prevalence?

Answer 1

positive and negative predictive values

- if you test for a disease w/high prevalence, it’s more likely that people who test + actually have the disease

Question 2

standard deviation

Answer 2

variability from mean

Question 3

standard error of the mean

Answer 3

variability between sample mean and true mean

Question 4

positive skew

Answer 4

mean > median > mode

Question 5

negative skew

Answer 5

mean < median < mode

Question 6

type I error

Answer 6

null hypothesis incorrectly rejected

- found a difference between treatment groups when there wasn’t one

Question 7

type II error

Answer 7

null hypothesis incorrectly accepted

- didn’t find a difference between treatment groups when there was one

Question 8

alpha

Answer 8

probability of type I error

Question 9

beta

Answer 9

probability of type II error

Question 10

power

Answer 10

probability of correctly rejecting null hypothesis (detecting a treatment effect)

Question 11

confidence interval

Answer 11

range in which real mean expected to fall

Question 12

t-test

Answer 12

compares means of 2 groups

Question 13

ANOVA

Answer 13

compares means of 3 groups