Statistics Chapter 1 Keywords

Question 1

Population

Answer 1

The whole set of items that are of interest

Question 2

Census

Answer 2

Observes or measures every member of a population

Question 3

Sample

Answer 3

A subset of the population which is used to find out information about the population as a whole

Question 4

Sampling units

Answer 4

Individual units of a population

Question 5

Sampling frame

Answer 5

A list of individually named or numbered sampling units

Question 6

Random sample of size n

Answer 6

A sample in which every sample of size n has an equal chance of being selected
Use random number generator and sampling frame or lottery sampling (hat)

Question 7

Systematic sampling

Answer 7

Individuals are chosen at regular intervals from an ordered list, the first person chosen is random

Question 8

Stratified sampling

Answer 8

Population is divided into mutually exclusive strata (eg males females) and a random sample is taken from each

Question 9

Quota sampling

Answer 9

Splitting the population into groups and sampling a given number of people from each group

Question 10

Opportunity/ convenience sampling

Answer 10

Sample taken from people who are available at the time when the study is being carried out and who fit the criteria you are looking for (first come first serve)

Question 11

Quantitative data/variables

Answer 11

Variables or data associated with numerical observations

Question 12

Qualitative variables/data

Answer 12

Variables or data associated with non-numerical observations

Question 13

Continuous variable

Answer 13

A variable that can take any value in a given range

Question 14

Discrete variable

Answer 14

A variable that can only take specific values in a given range

Question 15

Class boundaries

Answer 15

The maximum and minimum values in each class

Question 16

Midpoint

Answer 16

Average of the class boundaries

Question 17

Class width

Answer 17

Difference between the upper and lower class boundaries