topic 4

Question 1

categorical variabes are in different categories and not continuous

Answer 1

true

Question 2

categorical variable is often called an ordinal variable

Answer 2

true

Question 3

binary variable has

Answer 3

2 categories

Question 4

π is the parameter measured in terms of the proportion of people posessing the attribute

Answer 4

true

Question 5

1-π is

Answer 5

the proportion not possessing the attribute

Question 6

for binary variables SE is considered instead of SD

Answer 6

true

Question 7

√[π(1-π)/n] is the

Answer 7

SE of binary data

Question 8

binary analogue of unpaired T test

Answer 8

chi 2 test

Question 9

compares observed and expected 2x2 tables

Answer 9

true

Question 10

chi 2 test is done on frequencies and not percentages

Answer 10

true

Question 11

fishers exact test is used when

Answer 11

there is a count of lesser than 5 in any of the cells in the table

Question 12

degree of freedom in a chi2 is calcuated as

Answer 12

df=(r−1)×(c−1)

Question 13

what is cohens kappa

Answer 13

it calculates the agreement or consistency between two raters or judges when they are evaluating the same terms

Question 14

Cohen’s kappa is calculated as

Answer 14

k= p(obs) - p(exp)/1-p(exp)

Question 15

value of kapa varies from -1 to 1

Answer 15

true

Question 16

a kappa of 1, 0 and -1 indicates

Answer 16

perfect agreement, no agreement and disagreement respectively

Question 17

need to use natural logs for log or

Answer 17

true

Question 18

odds ratio

Answer 18

comparing the ratio of odds of one event to another

Question 19

odds ratio of =1, >1, <1 means

Answer 19

odds same in each grp, odds higher in exposed grp, odds lower in exposed grp

Question 20

odds ratio is particularly suited for a binary outcome with a binary predictor(exposure)

Answer 20

true