Biostats/Epi Week 3

Question 1

You are developing a new screen for heart disease which is found to correlate (r=0.7) with the “gold standard” blood test for cardiac enzymes. This is an indication of:

Answer 1

convergent validity

Question 2

Variable

Answer 2

Anything that can take on a different quality or quantity.

Question 3

Data distribution

Answer 3

listing of values associated with a particular variable in a collection of data

Question 4

Frequency distribution

Answer 4

table or graph that indicates how many times a value appears in a data set.

Question 5

Nominal level of measurement

Answer 5

simplest level of measurement; based on categories that are mutually exclusive and collectively exhaustive.

Question 6

Ordinal level of measurement

Answer 6

level of measurement that presumes order (i.e. greater than, less than).

Question 7

Interval level of measurement

Answer 7

measurement based on a scale of equal intervals (a.k.a. ratio level of measurement)

Question 8

Population (or universe)

Answer 8

all possible criteria cases; complete total cases possible

Question 9

Sample

Answer 9

Portion of the population collected; from the sample conclusions are drawn about the population

Question 10

Parameter

Answer 10

characteristic of a population

Question 11

Statistic

Answer 11

characteristic of a sample

Question 12

Descriptive Statistics

Answer 12

used to summarize or describe data distributions

Question 13

Inferential Statistics

Answer 13

used to make statements about a population

Question 14

You are studying a new screening test. There are 40 people who do not have a disease and 20 test negative for the disease with your new screen. Your new screen’s specificity is:

Answer 14

50%

Question 15

Your sample is normally distributed with a mean age of 57. The standard deviation in this sample is 5 years. The 2000 census shows your sample is older than a randomly selected national sample. You would expect 68% of your subjects to be:

Answer 15

Between the ages of 52 and 62

Question 16

Your results are 2,4,6,7,10,12. Your median is:

Answer 16

7

Question 17

The population in your state is 20% African American, 23% Latino, 17% Asian, and 40% other. A representative sample should include:

Answer 17

23% individuals from Latino populations

Question 18

You are studying a new screening test. There are 100 people who do not have a disease and 90 test negative for the disease with your new screen. There are 100 people who do have the disease and 80 test positive with your screen. The sensitivity of your screen is:

Answer 18

80%

Question 19

A study of 30 men was completed and ten watched three hours of television a day, ten watched two hours of television a day, three watched one hour of television a day and seven did not watch television. What was the cumulative percentage of men who watched less than two hours of television a day?

Answer 19

33%

Question 20

A neurology intern measures how many times per minute a specific brain wave cycles when a person is exposed to a heat source. She is measuring the brain wave response at what level of measurement?

Answer 20

Interval/ratio

Question 21

You administer your survey regarding eating habits of nurses to all the nurses who are in the cafeteria at lunchtime on a particular day. This is an example of what type of sample?

Answer 21

Convenience sampling

Question 22

You are looking for participants for a study for a new HIV vaccine. Participants must be 24-32 years old and newly sexually active. These are examples of:

Answer 22

Inclusion criteria

Question 23

Quantitative Data: Discrete

Answer 23

Deals with integers (number of objects or people)

Question 24

Quantitative Data: Continuous

Answer 24

Deals with a range (speed, weight, time); has meaning between integers

Question 25

Qualitative Data

Answer 25

Says something about the sample that cannot be counted