Unit 5

Question 1

census

Answer 1

systematically acqurin and recording relevant information about every member of a given popultion

Question 2

sample

Answer 2

slecting a proportion of the population and acquring and recording relevant information about those selected

Question 3

target population

Answer 3

the population to which it might be possible to extrapolate results

Question 4

source population

Answer 4

population for which the study subjects are drawn

Question 5

sampling frame

Answer 5

a list of all study subjects in the soruce population

Question 6

sampling units

Answer 6

the actual unit of measurement

Question 7

internal vaildity

Answer 7

the degree to which the observed findings in a study lead to correct inference about the outcome of interest

Question 8

external vailidity

Answer 8

the degree to which inferences drawn from a study can be generalized or extrapolated to the borader population of inteest

Question 9

non-probablity smapling

Answer 9

convenience sampling, judgment sampling, purposive sampling

study subjects are choosen in a non random way

Question 10

probabiltiy sampling

Answer 10

random process to selct study subjects, al indviduals hvve a non zero chance of being selected

simple random smaling
systematic random sampling 
stratified random sampling 
cluster sampling 
multistage sampling

Question 11

sample size for descriptive studies

Answer 11

1. esimate variance
2. level of confidence
3. precision

Question 12

sample size for analytical studies

Answer 12

1. state hypotheses
2. expected difference between two groups
3. power

Question 13

type 1 error

Answer 13

condlucing htere is a difference when there is not

confidence

Question 14

type 2 error

Answer 14

concluding there is no difference when ther is a difference

power