Keywords

Question 1

Arithmetic Mean

Answer 1

the correct name for the mean as it is usually worked out

Question 2

Average

Answer 2

the general name given to the measures of central location (mode, median and mean) : a typical value from data

Question 3

Base Year

Answer 3

the year which is the starting point from which all other years are compared, with the base year being given the value 100

Question 4

Bias

Answer 4

the name given to a sample that does not fairly represent the population it comes from

Question 5

Bimodal

Answer 5

a set of data that has two modes

Question 6

Bivariate Data

Answer 6

data that has two variable as in a scatter diagram

Question 7

Census

Answer 7

the data is obtained from every member of the population

Question 8

Chloropeth Map

Answer 8

a diagram where different shades or colours represent the data

Question 9

Continuous Data

Answer 9

data that can take any value between set limits

Question 10

Correlation

Answer 10

the measure of agreement between two variables

Question 11

Deciles

Answer 11

where ordered data is split into ten equal groups

Question 12

Discrete Data

Answer 12

data that can only take specific values

Question 13

Dispersion

Answer 13

the spread or width of data

Question 14

Event

Answer 14

in probability something which takes place such as rolling a die etc.

Question 15

Explanatory Variable

Answer 15

the variable you control, whose effect you want to investigate

Question 16

Extrapolation

Answer 16

an estimate made using a line of best fit from outside the range of data given

Question 17

Frequency Density

Answer 17

used to draw a histogram and is the actual frequency divided by the class width

Question 18

Frequency Polygon

Answer 18

a diagram for continuous data joining the midpoints of the class intervals at the appropriate frequencies

Question 19

Hypothesis

Answer 19

a statement you make which you think might be true

Question 20

Independent

Answer 20

two events are independent if the outcome of the second is not affected by the outcome of the first

Question 21

Index number

Answer 21

(current value of item/value of item in base year) x100

Question 22

Interpolation

Answer 22

a value found from a line of best fit from within known data values

Question 23

Interquartile Range

Answer 23

the upper quartile minus the lower quartile

Question 24

Lower Quartile

Answer 24

the value one quarter of the way up the data (often written as Q1)

Question 25

Moving Average

Answer 25

the mean of one cycle of data in a time series which gives a better view of the overall trend

Question 26

Mutually Exclusive

Answer 26

events that cannot both occur at the same time

Question 27

Negative Correlation

Answer 27

when one variable increases as the other decreases

Question 28

Open Ended Class

Answer 28

a class interval where the upper bound is not defined

Question 29

Outlier

Answer 29

a value that does not fit in well with the rest of the data

Question 30

Percentile

Answer 30

where ordered data is split into a hundred equal groups

Question 31

Pilot Survey

Answer 31

a small scale survey carried out before the main survey

Question 32

Population

Answer 32

every possible item that could occur in a given situation

Question 33

Positive Correlation

Answer 33

when one variable increases as the other increases

Question 34

Primary Data

Answer 34

data you collect yourself

Question 35

Proportional Pie Chart

Answer 35

the areas of the pie charts are used to compare the frequencies of the data

Question 36

Qualitative Data

Answer 36

non numerical data such as colour or favourites

Question 37

Quantitative Data

Answer 37

numerical data

Question 38

Quota

Answer 38

a specific number of people or items with a specific feature

Question 39

Random Sample

Answer 39

a sample where each member of the population has an equal chance of being selected

Question 40

Rank

Answer 40

the position of a piece of data in an ordered list

Question 41

Relative Frequency

Answer 41

a name for experimental probability

Question 42

Response Variable

Answer 42

the value that depends on changing the explanatory variable; the outcome you measure

Question 43

Sample

Answer 43

part of the population from which information is taken

Question 44

Sample Frame

Answer 44

the list of all members of the population available to be sampled

Question 45

Seasonal Effects

Answer 45

variation in data that follows a regular time pattern

Question 46

Secondary Data

Answer 46

data that someone else has collected

Question 47

Skew Data

Answer 47

data that is unequally spread either side of a central value

Question 48

Spread

Answer 48

whether values in a set of data are close to each other

Question 49

Stratified Sample

Answer 49

a sample with consideration for different groups within the population

Question 50

Symmetrical Data

Answer 50

data that i s equally spread either side of the centre

Question 51

Time Series

Answer 51

any set of data that has values recorded at different times

Question 52

Upper Quartile

Answer 52

the value three quarters of the way up the data (often written as Q3