stats unit 3

Question 1

Simple random sample

Answer 1

putting all of the names into a hat then randomly give everybody a number and generate a list of numbers 1.label 2 RNG 3.,compare

Question 2

strata

Answer 2

dividing all populations into sub populations then take a random sample from all the populations

Question 3

cluster

Answer 3

representatives are closer at random for each cluster. Then a census is done on that cluster. Census ‘s must be done on the ENTIRE POPULATION

Question 4

Multistage

Answer 4

any combination of. the samples ( SRS, Strata,Cluster, etc)

Question 5

Systematic

Answer 5

chose a random starting point and select individuals systematically from a sample

Question 6

bias

Answer 6

any systematic failure of a sampling method

Question 7

voluntary reaponse

Answer 7

the only people to participate, and the ones that are volunterring too

Question 8

undercoverage

Answer 8

when the sampleing frame is too limited

Question 9

non response

Answer 9

trying to give a survey but people refuse or no do not or can respond, most of the responded are motivated

Question 10

convenience

Answer 10

to simple of a frame, not being rigorous

Question 11

multistage

Answer 11

many of these bias are mutually exclusive and situations that cause them will often times overlap

Question 12

observational study’s

Answer 12

a study based on past and future data in which no manipulation of factors have been employed

Question 13

retrospective study

Answer 13

“past study” where subjects are selected and previous data is looked at

Question 14

prospective study

Answer 14

“future study” in which subjects are selected to observe future outcomes

Question 15

matching

Answer 15

a technique to reduce variability’s, used with similar characteristics that may be matched together

Question 16

control

Answer 16

we control factors

Question 17

randomization

Answer 17

randomization allows us to minimize confounding variable

Question 18

replicate

Answer 18

apply treatment to a number of subjects

Question 19

blocking

Answer 19

means grouping not preventing it stopping

Question 20

control group

Answer 20

a experimental unit assigned to a baseline treatment level, normally on a default treatment

Question 21

blinding

Answer 21

helps eliminate personal judgement and behaviors on the assignment