When 1564 American households were surveyed, it was found that 57% of them owned two cars.

1564 ; people who owned tow cars

1564 ; 57%

American Households ; 1564

American Households ; 57%

A survey of 1103 students was taken from a university with 18,500 students.

Statistic – it uses numbers

Parameter – describes a population

Parameter – it used a large enough sample size

Statistic – describes a sample

descriptive statistics

inferential statistics

Sample – easier to collect a sample than to do a census

Population – more accurate results from a population

number of milligrams of tar in 28 cigarettes

interval

nominal

ratio

ordinal

the years the summer Olympics were held in the United States

nominal

interval

ratio

ordinal

A study where a political pollster wishes to determine if his candidate is leading in the polls

observational study

survey

simulation

experiment

A researcher randomly selects and interviews fifty male and fifty female teachers.

convenience

random

cluster

stratified

systematic

In a recent television survey, participants were asked to answer “yes” or “no” to the question “Are you in favor of the death penalty?” Six thousand five hundred responded “yes” while 3700 responded “no”. There was a fifty-cent charge for the call.

random

convenience

stratified

systematic

cluster

Explain what bias there is in a study done entirely online.

1) Only people who care about the topic will respond

2) If the wireless is dropped that will not be able to finish the study

3) Only crazy people go online

4) It limits the sample to only people that are online

Explain the differences between cluster sampling and stratified sampling.

1) Cluster is taking everyone from a couple of randomly selected groups, and stratified if taking a couple from every group.

2) Stratified is taking everyone from a couple of randomly selected groups and cluster is taking a couple from every group

1) An experiment has a control group

2) An experiment imposes a treatment

3) An observational study is done with individuals and an experiment is done with groups

4) An observational study changes the environment

Block – Design

Stratified – Random

Double – Blind

Matched – Pair

Block – Design

Double – Blind

Stratified – Random

Matched – Pair

Block – Design

Double – Blind

Matched – Pair

Stratified Random

1) To get more people involved

2) To have something to compare the statistics to

3) To make sure individuals respond correctly

4) To control the placebo effect

observational study

simulation

experiment

survey

observational study

simulation

survey

experiment

systematic

random

convenience

stratified

cluster

random

convenience

cluster

systematic

stratified

systematic

cluster

convenience

stratified

random

numbers on the shirts of a girl’s soccer team

ordinal

interval

ratio

nominal

temperatures of 22 selected refrigerators

nominal

ordinal

ratio

interval

the ratings of a movie ranging from “poor” to “good” to “excellent”

interval

ordinal

ratio

nominal

Computers

18%

American Households

1353

A Recent survey by the alumni of a major university indicated that the average salary of 10,000 of its 300,000 graduates was $125,000.

Parameter

Statistic

The average age of the students in a college psychology call is 22 years old.

Inferential

Descriptive

1) A sample has to be less that 50

2) A sample involves object while a population involves the study of individuals

3) Statistics can only be made from samples

4) A sample is a subset of the population