Epidemiology/Biostatistics II

Question 1

measure of central tendency

Answer 1

mean
median
mode

Question 2

mode

Answer 2

most common

Question 3

median

Answer 3

middle value

Question 4

standard distribution

Answer 4

68
95
98

Question 5

positive skew

Answer 5

mean greater than median greater than mode

Question 6

negative skew

Answer 6

mean less than median less than mode

Question 7

null hypothesis

Answer 7

no difference or relationship

Question 8

alternative hypothesis

Answer 8

some difference or relationship

Question 9

type I error

Answer 9

alpha

saying effect when none exists

Question 10

type II error

Answer 10

beta

stating no effect when one exists

Question 11

confidence interval

Answer 11

range of values in which specified probability of means of repeated samples would be expected to fall

95% confidence interval - p = 0.05

Question 12

t-test

Answer 12

difference means between 2 groups

Question 13

anova

Answer 13

differences between means of 3 or more groups

Question 14

chi-square

Answer 14

difference between 2 or more percentages of categorical outcomes

Question 15

pearson correlation coefficient

Answer 15

+1 to -1

closer to 1 - stronger correlation

coefficient of determination - r ~2
-correlation coefficient squared

Question 16

primary disease prevention

Answer 16

prevent occurences - vaccine

Question 17

secondary disease prevention

Answer 17

screening early for disease - pap smear

Question 18

tertiary disease prevention

Answer 18

tx - reduce disability of disease

Question 19

parts of medicare

Answer 19

A - hospital insurance
B - basic medical bills
C - private companies
D - drugs