Unit 1

Question 1

One variable stats

Give 3 examples

Answer 1

Flipping a coin
Test scores
Rolling a dice

Question 2

Two variable stats

Answer 2

Comparison data (x, y)

Question 3

Primary source stats

Answer 3

The data is collected directly

Ex. Surveys and traffic

Question 4

Secondary source stats

Answer 4

The data is collected by another source and organized, analyzed or presented by you
Ex. Stats Canada, newspaper

Question 5

What is a circle graph used for

Answer 5

Gender stats, percents, comparisons

Question 6

What graph do you use for a frequency table

Answer 6

Bar, histogram

Question 7

Pictograph

Answer 7

The size of picture represents the amount of data

Question 8

What is a scatterplot

Answer 8

2 variables, comparison

Question 9

What is a line graph for

Answer 9

Temperature, things that change over time

Question 10

What is population

Answer 10

All individuals being studied

Question 11

What is a sample

Answer 11

Representative group from the sample

Question 12

Simple random sample

Answer 12

Everyone has the same chance of being picked a random # generator picks

Question 13

Systematic sample

Answer 13

Go through the population in order and pick at a regular person like every 10th person

Question 14

Strata definition

Answer 14

Groups that share common characteristics (gender, age, education)
Ex. If there are more guys than girls in your population make sure to survey more boys than girls so that you get an accurate sample

Question 15

Stratified sample

Answer 15

Individuals chosen for sample group, have same strata break down as the population

Question 16

Cluster

Answer 16

Many people in a few small regions are surveyed and the others are ignored
Ex. Liberals call 905 belt because that’s where there supporters are

Question 17

Convince sample

Answer 17

You sample a group in the quickest easiest way possible

Ex. Suggestion box

Question 18

Voluntary response

Answer 18

Sample group is not required to complete the survey

Ex. Online polls

Question 19

Sampling bias (4)

Answer 19

• bad sample is chosen
• data-collection method is flawed
• sample doesn’t reflect actual population
• asking grade 12s if data management is a good pre-requisite for university when you should be asking those in university and the profs

Question 20

Non response bias (2)

Answer 20

• groups are under-represented because they chose not to participate
• Trent university had 10% of grad respond to a survey

Question 21

Measurement bias (2)

Answer 21

• data collection method consistently under or over estimating a characteristic
  Ex. Leading questions

Question 22

Response bias (2)

Answer 22

• participants deliberately give false or misleading answers due to embarrassment or want to influence the result
  Ex. mr Groot asking if any grade nines have left the property

Question 23

Central tendency

Answer 23

Finding values where a set of data tends to cluster

Ex. 3 M’s

Question 24

What does N equal

Answer 24

of data points

Question 25

What are outliers

Answer 25

A value that is distant from majority of the data.

Outliers really effect the mean

Question 26

Measures of spread

Answer 26

Used to indicate how closely a set of data clusters around its Center (usually the mean)
How spread Out The data is
Ex. Max, min, range

Question 27

Standard deviation

Answer 27

The most common measure of spread

Shows how far each data point is from the mean and then compares them

Question 28

What are statistics

Answer 28

The collecting, organization, analysis and presentation of the data.

Question 29

Standard mean

Answer 29

Sum of all data points divided by “n” which is the total # of data points

Question 30

Weighted mean

Answer 30

Where certain people in your data set have more value then others. Counts as more then one point.
Ex. Teachers count as 3x the points in a student teacher survey