Test 5

Question 1

Voluntary response

Answer 1

Chooses itself

Call in, write in, text in

Question 2

Convenience sampling

Answer 2

Selection of whichever individuals are the easiest to reach

Malls

Question 3

SRS

Answer 3

Simple random sample, usually does not estimate the truth about the population exactly

Question 4

Margin of error

Answer 4

Tells how close our estimate comes to the truth

1/rootn

Question 5

You want ____sample and _____error

Answer 5

Bigger, smaller

Question 6

What we say about the margin of error

Answer 6

We are 95% confident the truth lies between ____ and ____

Question 7

Parameter

Answer 7

The truth (actual number)

Question 8

How to reduce the variability of an SRS

Answer 8

Use a larger sample

Question 9

Confidence statement

Answer 9

We are 95% confident that between 54% and 60% of all adults bought a lottery ticket in the last 12 months

Question 10

The variability if a statistic from a random sample____________

Answer 10

Does not depend on the side of the population

Question 11

We want a ____ margin of error with _____ confidence

Answer 11

Smaller, the same

Question 12

How to achieve a smaller margin of error with the same confidence

Answer 12

Take a larger sample

Question 13

Parameter describes a

Answer 13

Population

Question 14

Statistic

Answer 14

A number that describes a sample

Estimates an unknown parameter

Question 15

Bias

Answer 15

Consistent repeated deviation of the sample statistic in the same direction when many samples are taken

Question 16

Variability

Answer 16

Describes how spread out the values of the sample statistic are

Question 17

A good sampling method has both _____ bias and _____variablility

Answer 17

Small, small

Question 18

To reduce bias use:

Answer 18

Random sampling

Question 19

Sampling errors

Answer 19

Errors caused by the act of taking a sample

Question 20

Random sampling error

Answer 20

Caused by chance in selecting a random sample

Question 21

Nonsampling errors

Answer 21

Not related to the act of selecting a sample from the population. Can be in a census

Question 22

Processing errors

Answer 22

Mechanical mistakes

Ex: typos

Question 23

Response errors

Answer 23

Someone gives incorrect response (lies)

Question 24

Non-response

Answer 24

Failure to obtain data from an individual

Question 25

Sampling frame

Answer 25

A list of individuals from which we draw our samples

Question 26

Undercoverage

Answer 26

Occurs when some groups in the population are left out

Question 27

Stratified random sample

Answer 27

Splitting into sections/groups

Question 28

Probability sample

Answer 28

Chosen by choice, what chance/probability each possible sample has