Unit Quiz 4

Question 1

Multistage sample

Answer 1

More than 1 method used

Question 2

Stratified random sample

Answer 2

gives more precise estimates
Works best when individuals within each stratum are similar w regard to what is being measured and different between strata

Question 3

What is stratified

Answer 3

Some from all

Question 4

Clusters

Answer 4

All from some

Question 5

Inference

Answer 5

Process of drawing conclusions based on sample data

Question 6

What is in common about convenience and voluntary samples

Answer 6

They are biased

Question 7

What is SRS

Answer 7

simple
Chosen in such a way that every set of n individuals has an equal chance of being the sample

Question 8

Under coverage

Answer 8

What’s most common
When some members of the population cannot be chosen in a sample

Question 9

Non responded

Answer 9

When an individual chosen for the sample cannot be contacted or refuses to participate

Question 10

Can surveys be non response

Answer 10

No cuz they r voluntary and every individual simply chooses whether they even opt in

Question 11

Response bias

Answer 11

When people give inaccurate answers to survey questions and there is a systematic pattern of inaccurate

Question 12

Observational study vs experiment

Answer 12

Observational study observes individuals, and measures variables of interest, but does not attempt to influence the responses, while an experiment deliberately imposes some treatment on individuals to measure their responses 

Question 13

Confounding

Answer 13

Confounding occurs when two variables are associated in such a way that their effects on response cannot be distinguished from one another 

Question 14

When asked to identify a possible, confounding variable on AP exam include

Answer 14

How the variable you chose is associated with the explanatory variable, how the variable you chose, affects the response 

Question 15

Treatment

Answer 15

A specific condition applied to the individuals in experiments

Question 16

Experimental unit

Answer 16

Experimental units are the smallest collection of individuals which treatments are applied


Question 17

How is a treatment formed?

Answer 17

It is formed by combining a specific value, called the level of each of the factors(explanatory variables)
P S. Treatments are not explanatory variables, 

Question 18

Four principles of experimental

Answer 18

 Comparison, random assignment, control, and replication 

Question 19

Comparison

Answer 19

compare 2+ treatments

Question 20

Random assignment

Answer 20

Randomly assign experimental units to treatment groups

Question 21

Control

Answer 21

Keep other variables the same for all grouos

Question 22

Replication

Answer 22

Use enough units to Eliminate te chance outcomes

Question 23

Sample is with method as experiment is with

Answer 23

Treatment

Question 24

Double blind

Answer 24

Neither subjects nor those who interact w them and measure the response know of the subject received a placebo

Question 25

Statistically significant

Answer 25

An observed effect so large that it would rarely occur by chance

Question 26

Block

Answer 26

A group of experimental units known to be similar

Question 27

Randomized block

Answer 27

Random assignments of experimental units to treatments is carried out separately within each block

Question 28

Matched pairs

Answer 28

Each block consists of a matched pair of experimental units. Sometimes a pair consists of a single unit who receives both treatments in random orders. 

Question 29

If individuals are randomly selected, you can make an inference about?

Answer 29

The population

Question 30

If individuals are randomly signed to groups, you can make an inference about ?

Answer 30

Cause-and-effect