6.1 Sampling and 6.2 Presentation of Data

Question 1

Univariate analysis

Answer 1

Involves a single variable

Question 2

Qualitative data

Answer 2

The qualities of something

Question 3

Quantitative data

Answer 3

Numbers, anything that can be counted or measured

Question 4

Discrete

Answer 4

Exact numerical values (fixed values)

Question 5

Continuous

Answer 5

Measured values (within a range)

Question 6

Population

Answer 6

All members of a defined group

Question 7

Sample

Answer 7

A subset of the population

Question 8

Convenience sampling

Answer 8

You select those members of the population who are most easily accessible or readily available

Question 9

Simple random sampling

Answer 9

Each member of the population has an equal chance of being selected

Question 10

Systematic sampling

Answer 10

You list the members of the population and select a sample according to a random point and a fixed point

Question 11

Stratified sampling

Answer 11

The population is divided into smaller groups known as strata. The strata are formed based on members’ shared characteristics. You then choose a random sample from each stratum and put them together to form your sample

Question 12

Quota sampling

Answer 12

This is like stratified sampling but involves taking a sample size from each stratum which in proportion to the size of the stratum

Question 13

Frequency table

Answer 13

When you have raw data, a frequency table is an easy way to view and organize your data quickly. Data can then be put into a bar chart or histogram

Question 14

Bar chart

Answer 14

Suitable for discrete dates. Bars have gaps

Question 15

Histogram

Answer 15

Suitable for continuous data. Bars have no gaps

Question 16

Is favorite color qualitative or quantitative?

Answer 16

Qualitative

Question 17

Is annual salary qualitative or quantitative?

Answer 17

Quantitative

Question 18

Is shoe size discrete or continuous?

Answer 18

Discrete

Question 19

Is time take to get home from school discrete or continuous?

Answer 19

Continuous

Question 20

Identify the population and sample. “A recent study of 2625 elementary students found 28% live in a single-parent household”

Answer 20

Elementary students is the population and 2625 is the sample

Question 21

What kind of sampling? “People in the same room as you”

Answer 21

Convenience

Question 22

What kind of sampling? “Names in a hat”

Answer 22

Simple random

Question 23

What kind of sampling? “Every 10th person in a line”

Answer 23

Systematic

Question 24

What kind of sampling? “Separate by class, pick 20 from each”

Answer 24

Stratified

Question 25

What kind of sampling? “100 females between the ages of 15 and 25”

Answer 25

Quota

Question 26

When most of the data is on the right of a histogram, which way is it skewed?

Answer 26

Left (negative)

Question 27

When most of the data is on the left of a histogram, which way is it skewed?

Answer 27

Right (positive)

Question 28

When most of the data in a histogram is in middle, which way is it skewed?

Answer 28

Normal (centered)

Question 29

Is a histogram used for discrete or continuous data?

Answer 29

Continuous