Stats

Question 1

Linear Interpolation

Answer 1

(Beginning of group) + ((However far into group) / (Frequency of group) × (Class width))

Question 2

Conditions under which the Binomial Distribution can be approximated by a Normal Distribution

Answer 2

n must be large

p must be close to 0.5

Question 3

Simple Random Sampling

Answer 3

• Allocate each member of the population a unique number
• For this you will need a sampling frame (a list of the items in the population)
• Now select numbers at random

Question 4

Systematic Sampling

Answer 4

• The elements are chosen at regular intervals from an ordered list (e.g Choose every 10th item if you want your sample to be 10% of the population)
• The 1st item must be chosen randomly

Question 5

Stratified Sampling

Answer 5

• The population is divided into mutually exclusive groups

- A random sample is taken from each group in proportion to the size of the group

Question 6

Quota Sampling

Answer 6

• Select a sample and reflect the characteristics of the population
• The population is divided into different groups according to a characteristic
• Interview people and decide which group they are in, continue until all quotas filled

Question 7

Opportunity (Convenience) Sampling

Answer 7

• A sample is taken from anyone who is available at the time of the study and meets the required criteria

Question 8

Test Statistic

Answer 8

A statistic that is calculated from sample data in order to test a hypothesis about a population

Question 9

Product Moment Correlation Coefficient

Answer 9

Linear association between two variables

Question 10

Hypothesis Test

Answer 10

A statistical test that is used to determine whether there is enough evidence in a sample of data to infer that a certain condition is true for the entire population

Question 11

Critical Value

Answer 11

The point (or points) on the scale of the test statistic beyond which we reject the null hypothesis