Stats

Question 1

Numerical data

Answer 1

Data is on numbers eg. shoe size

Question 2

Categorical data

Answer 2

Data is text eg. hair colour

Question 3

Discrete data

Answer 3

Whole numbers eg. number of people in a family

Question 4

Continuous data

Answer 4

Can be decimals eg. height

Question 5

Ordinal data

Answer 5

categorical data that can be put in order

Question 6

Nominal data

Answer 6

Categorical data that cant be put in order eg. phone brand

Question 7

Primary data

Answer 7

First hand data

Question 8

Secondary data

Answer 8

Secondary data

Question 9

Population

Answer 9

Entire group being studied

Question 10

Sample

Answer 10

Group selected from population

Question 11

Outlier

Answer 11

Extreme value that is not similar to other values in the data set

Question 12

Collecting data

Answer 12

Sample must be randomly selected - prevent bias
Sample must represent population
Sample must be sufficiently large

Question 13

Bar chart

Answer 13

Individual bars + axis must be labelled
Even scale
use a ruler
Categorical data

Question 14

Trend graphs

Answer 14

Label axis
Scale

Question 15

Line plot

Answer 15

Clear columns of X
Label columns
Can be used for categorical data

Question 16

Pie charts

Answer 16

Circle drawn with compass
Angles measured with protractor
Label angles and sectors
Can be used for categorical data

Question 17

Histogram

Answer 17

Scale along both axis
Axis labelled + evenly drawn with ruler
Can be used for continuous numerical data

Question 18

Stem and leaf plot

Answer 18

First column = stem (the tens)
Second column = leaf (units)
Include key ed. 3 I 4 = 34
Separate leaves with comas

Question 19

Mean - def

Answer 19

The sum of all the values devided by the number of values

Question 20

The mean - pros + cons

Answer 20

Pros: Uses all the data
Cons: Affected by outliers

Question 21

Mode - def

Answer 21

The number that appears most often

Question 22

Mode - Pros + cons

Answer 22

Pros: Not affected by outliers, can be used for any type of data
Cons: Does not use all the data

Question 23

Median - def

Answer 23

Middle value when values are in numerical order

Question 24

Median pros + cons

Answer 24

Pros: Easy to calculate, not affected by outliers
Cons: Does not use all data

Question 25

Range

Answer 25

Difference between highest + lowest value