Eval Science

Question 1

best measurement for range

Answer 1

nominal and ordinal

Question 2

best measurement for interquartile range

Answer 2

ordinal

Question 3

what’s central limit theorem

Answer 3

mean follows normal distribution

Question 4

null hypothesis

Answer 4

Xmale-Xfemale=0

Xmale=Xfemale

Question 5

method to increase power

Answer 5

increase sample size

Question 6

r is…

Answer 6

Pearson Coefficent

strength of association

Question 7

R^2 is

Answer 7

coefficent of determination
-strength of association
R^2=r*r

Question 8

B1

Answer 8

regression coefficent

slope

Question 9

Bo

Answer 9

intercept

Question 10

one sample t test

Answer 10

made 2 measurements on same subject

Question 11

is ANOVA the end of testing?

Answer 11

no there’s pairwise comparison

Question 12

X=continuous

Y=nominal/ordinance

Answer 12

logistic regression

Question 13

t-test, ANOVA: nominal variance only has ___ level

Answer 13

2

Question 14

ANOVA: nominal variance has ____ level

Answer 14

2 or more

Question 15

McNemar example

Answer 15

2 anesthetics compared

-each individual receives both

Question 16

A researcher was running the same statistical test on a number of collected samples. Using an
alpha of 0.05, there were 10 significant results. If the researcher changed alpha to 0.10, you
would expect to have ________ significant results

Answer 16

more

Question 17

T/F: Alpha is proportional to the sample size

Answer 17

F

Question 18

T/F: Beta is inversely proportional to the sample size

Answer 18

T

Question 19

t/f: Power is inversely proportional to the sample

Answer 19

F

Question 20

t/f: A researcher at Ohio State published a paper in which she rejected the null hypothesis in
favor of the alternative hypothesis. The p-value for the research question and subsequent
statistical test was 0.07. She was using an alpha level of 0.05. She should have rejected the
null hypothesis

Answer 20

F

Question 21

A researcher at Ohio State published a paper in which she rejected the null hypothesis in
favor of the alternative hypothesis. The p-value for the research question and subsequent
statistical test was 0.07. She was using an alpha level of 0.05. She should have rejected the
null hypothesis: what is the type I error for the experiment?

Answer 21

0.07

Question 22

Which term best describes the ability of the statistical test to detect a specified difference if
that difference really exists?

Answer 22

power

Question 23

t/f: In a journal article, the authors report that, “… the BEO and BF groups had significantly lower
MGI values at six months (P

Answer 23

t

Question 24

t/f: In a journal article, the authors report that, “… the BEO and BF groups had significantly lower
MGI values at six months (P

Answer 24

f

Question 25

t/f: In a journal article, the authors report that, “… the BEO and BF groups had significantly lower MGI values at six months (P0.999

Answer 25

f

Question 26

In which type of study are the subjects selected on the basis of whether they do or do not have a particular disease?

Answer 26

case control study

Question 27

In which one of the following study types is a group or groups of individuals defined on the basis of exposure to a suspected risk factor for disease?

Answer 27

longitudinal cohort study

Question 28

Which of the following are descriptive studies?

Answer 28

case report correlational cross sectional

Question 29

t/f: A prospective cohort study is valuable because it allows investigators to study rare diseases more easily

Answer 29

f

Question 30

t/f: Case-control studies allow studying diseases with long latency periods.

Answer 30

t

Question 31

r is

Answer 31

a measure of association

Question 32

R^2 is

Answer 32

a measure of association

Question 33

Bo is

Answer 33

value of Y when X is 0

Question 34

B1 is

Answer 34

change in Y for each single unit change in X

Question 35

Which one of the following study types could best be identified as a “snapshot in time?

Answer 35

cross sectional study

Question 36

t/f: Chi-square tests are used to evaluate the dependence or independence of two nominal or ordinal variables.

Answer 36

t

Question 37

t/f: The Wilcoxon Sign Rank test requires nominal or ordinal variables

Answer 37

f

Question 38

When the requirements for an independent t-test are not met, the appropriate nonparametric test would be

Answer 38

wilcoxon rank sum test

Question 39

t/f: The t-test can differentiate between two or more groups.

Answer 39

f

Question 40

t/f: The ANOVA test requires that the groups all be distributed normally but they can have different variances.

Answer 40

f

Question 41

t/f: When testing 4 groups with ANOVA, if the p-value for the ANOVA test is less than 0.05, then the researcher can say that each of the groups differs from all of the others.

Answer 41

f

Question 42

When p is greater than alpha, what do u do with the hull hypothesis?

Answer 42

Reject null because no significance