Keywords Flashcards Preview

GCSE Statistics > Keywords > Flashcards

Flashcards in Keywords Deck (52)
Loading flashcards...
1

Arithmetic Mean

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

2

Average

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

3

Base Year

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

4

Bias

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

5

Bimodal

a set of data that has two modes

6

Bivariate Data

data that has two variable as in a scatter diagram

7

Census

the data is obtained from every member of the population

8

Chloropeth Map

a diagram where different shades or colours represent the data

9

Continuous Data

data that can take any value between set limits

10

Correlation

the measure of agreement between two variables

11

Deciles

where ordered data is split into ten equal groups

12

Discrete Data

data that can only take specific values

13

Dispersion

the spread or width of data

14

Event

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

15

Explanatory Variable

the variable you control, whose effect you want to investigate

16

Extrapolation

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

17

Frequency Density

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

18

Frequency Polygon

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

19

Hypothesis

a statement you make which you think might be true

20

Independent

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

21

Index number

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

22

Interpolation

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

23

Interquartile Range

the upper quartile minus the lower quartile

24

Lower Quartile

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

25

Moving Average

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

26

Mutually Exclusive

events that cannot both occur at the same time

27

Negative Correlation

when one variable increases as the other decreases

28

Open Ended Class

a class interval where the upper bound is not defined

29

Outlier

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

30

Percentile

where ordered data is split into a hundred equal groups