Everything

Question 1

What is a census?

Answer 1

A survey of a whole population.

Question 2

What is a sample?

Answer 2

A smaller number of items from the population.

Question 3

What does ‘biassed sample’ mean?

Answer 3

Not representative of everyone in the population.

Question 4

Define discrete data.

Answer 4

Row value, grouped data with no inequalities.

Question 5

Define continuous data.

Answer 5

Grouped data with inequalities.

Question 6

What is systematic sampling?

Answer 6

Finding nth interval = Population size / Sample size.

Question 7

What is stratified sampling?

Answer 7

Members of each stratum are in proportion to the size of the stratum.

Question 8

What is random sampling?

Answer 8

Every member of the population has an equal chance of being selected.

Question 9

What is frequency density?

Answer 9

Frequency / Class Width.

Question 10

What is qualitative data?

Answer 10

Non-numerical observations.

Question 11

What is primary data?

Answer 11

Collected by, or for, the person using it.

Question 12

What is secondary data?

Answer 12

Has already been collected by someone else.

Question 13

What is a control variable?

Answer 13

Variable that is kept constant during an experiment.

Question 14

What is a matched pairs test?

Answer 14

Two groups of equally matched people used to test the effect of a particular factor.

Question 15

What is skewness?

Answer 15

A measure of the asymmetry of the probability distribution of a real-valued random variable.

Question 16

What does PMCC stand for?

Answer 16

Pearson’s Product-Moment Correlation Coefficient.

Question 17

What does SRCC measure?

Answer 17

The strength of the correlation between two variables.

Question 18

What is a line of best fit?

Answer 18

A straight line that best represents the data on a scatter plot.

Question 19

What does interpolation mean?

Answer 19

Using the line of best fit to estimate within the range of values already plotted.

Question 20

What is extrapolation?

Answer 20

Extending the line of best fit and reading values outside the range of values plotted.

Question 21

What is cumulative frequency?

Answer 21

A running total of the frequencies of each class interval.

Question 22

What is the interquartile range (IQR)?

Answer 22

IQR = Upper Quartile (UQ) - Lower Quartile (LQ).

Question 23

Define standard deviation.

Answer 23

A measure of how far all the values are from the mean value.

Question 24

What is a random response method?

Answer 24

Uses a random event to decide how to answer a question.

Question 25

What is the mode?

Answer 25

The most common value in a dataset.

Question 26

What is the median for discrete data?

Answer 26

(n + 1)th value.

Question 27

What is the formula for the equation of the line of best fit?

Answer 27

y = ax + b.

Question 28

What is the definition of a population in statistics?

Answer 28

Everything or everybody that could possibly be involved in an investigation.

Question 29

What are outliers?

Answer 29

Values that lie outside the normal range of data.

Question 30

What is a scatter diagram used for?

Answer 30

To display bivariate data.

Question 31

What is a qualitative question?

Answer 31

A question that has no suggested answer.

Question 32

What is a closed question?

Answer 32

A question with a set of given answers to choose from.

Question 33

What is the purpose of using simulations in data collection?

Answer 33

To model random real-life events and predict outcomes.

Question 34

What is the formula for the Petersen capture-recapture method?

Answer 34

N = (Mn) / m.

Question 35

What is the 'response variable' in an experiment?

Answer 35

The variable that is measured to see how it is affected.

Question 36

What is the difference between qualitative and quantitative data?

Answer 36

Qualitative data is non-numerical; quantitative data is numerical.

Question 37

What is the weighted mean?

Answer 37

Mean calculated for data with different weights for each group.

Question 38

What is the geometric mean?

Answer 38

The nth root of the product of n values.

Question 39

What does 'cumulative frequency curves' represent?

Answer 39

Used for continuous data to show running totals.

Question 40

What is the purpose of a sampling frame?

Answer 40

A list of people/items that are to be sampled.

Question 41

What is a cluster sampling method?

Answer 41

The population is divided into groups, and then groups are randomly selected.

Question 42

What is systematic sampling?

Answer 42

Choosing a starting point at random and then selecting every nth member.