Quiz 1

Question 1

Survet definition

Answer 1

uncontrolled collection of available. You can only use what we have

Question 2

experiment defintion

Answer 2

controlled generation and collection of data

Question 3

population definition

Answer 3

collection of all subjects or objects of interest

Question 4

sample definition

Answer 4

a subset of the population, selected by some members of the given population,

Question 5

sampling definition

Answer 5

a way of generating a sample by selecting some members of the given population

Question 6

What does the sample represent?

Answer 6

the population or close to it

Question 7

definition of statistic

Answer 7

a numerical measure obtained from a sample used to categorize the sample.

Question 8

definition of parameter

Answer 8

a numerical measure that characterizes the entire population

Question 9

In most cases, can we calculate the parameter

Answer 9

no

Question 10

definition of simple random sample

Answer 10

random sample in which each group member has the
same probability of being selected.

Question 11

How is simple random sample usually obtained

Answer 11

by using random numbers

Question 12

definition of random numbers (n)

Answer 12

a collection of numbers that are each likely to occurr with probability 1/n for each number

Question 13

What are the 2 properities of random numbers

Answer 13

Each digit 0, 1, 2, . . . , 9 is equally likely to occur.
(2) The value of any particular digit is independent of the value of any other digit
selected.

Question 14

definition of bias

Answer 14

anything that produces systematic errors in data

Question 15

definition of sampling bais

Answer 15

systematc error to a nonrandom nature of the sample

Question 16

what is a measurement bias

Answer 16

systmatic error that happern in collecting data. equipment and people mare erroes

Question 17

recall or memory bias

Answer 17

response are affected by responders memory

Question 18

which one is better: short term or long term memory

Answer 18

short term

Question 19

What is a randomized clinical trial

Answer 19

a type of research design used for comparing different
treatments, in which patients are assigned to a specific treatment by some random
mechanism. T

Question 20

What happens before starting a clinical trial?

Answer 20

you have to write a proposal that describes in detail the design of proposed reasearch

Question 21

What are the 2 experimental groups that clinical trials have?

Answer 21

teatment and control

Question 22

What is the treatment group

Answer 22

drug or intervention of interest

Question 23

What is the control group?

Answer 23

another drug, procedure, or placebo

Question 24

What is the purpose of blinding and randomization

Answer 24

it helps minimize bias

Question 25

What is Block randomization?

Answer 25

in clinical trials comparing two treatments (treatments A and B). A block size of 2n is determined in advance, where for every 2n patients entering the study, n patients are randomly assigned to treatment A and the remaining n patients are assigned to treatment B.

Question 26

single blind study

Answer 26

the patient does not know the treatment and group assignment, but the physician does.

Question 27

double blind study

Answer 27

neither patient or physican knows treatment or group assignment

Question 28

unblinded study

Answer 28

both patient and the doctor knowns the treatment and group assignments