Sampling, Data Presentation And Interpretation

Question 1

What is the IV and DV

The total weight in a lift and the number of people in the lift

Answer 1

IV= number of people in the lift

DV= total weight in the lift

Question 2

what is defined as an outlier in terms of SD?

Answer 2

± 2SD from mean

Question 3

what is defined as an outlier in terms of quartiles?

Answer 3

+ 1.5 IQR above UQ

-1.5 IQR below LQ

Question 4

given you have 10 values how many modes would you have to have for the data to be evenly spread?

Answer 4

close to 10 or 0

Question 5

How do you calculate variance from SD?

Answer 5

SD^2

Question 6

How is the area under a histogram linked to the frequecy?

Answer 6

Proportional

Question 7

What is the difference between interpolation and extrapolation?

Answer 7

inter= estimating within data set 
extra = estimating outside data set

Question 8

What are the different sampling techniques

Answer 8

Random
Stratified
Systematic
Cluster
Opportunity

Question 9

Describe random sampling

Answer 9

Data chosen at random

Repeats ignored

Question 10

Describe Systematic sampling

Answer 10

Choosing data at regular intervals

Question 11

Describe cluster sampling

Answer 11

Data is grouped into clusters and you choose clusters

Question 12

Describe Stratified sampling

Answer 12

Data is proportional (combinen with random to get best results) to population

Question 13

Describe opportunity sampling

Answer 13

Data selected from population that are available and fit the criteria

Question 14

Advantages of random sampling

Answer 14

Fair and unbiased

Question 15

Advantages of Systematic sampling

Answer 15

Unlikely to be bias

Question 16

Advantages of cluster sampling

Answer 16

Quick and efficient

Question 17

Advantages of Stratified sampling

Answer 17

Best way to fairly reflect pop

Question 18

Advantages of opportunity sampling

Answer 18

Can be done immediately

Question 19

Disadvantages of random sampling

Answer 19

Can be time consuming

Impractical on large scale

Question 20

Disadvantages of Systematic sampling

Answer 20

May not be random

Question 21

Disadvantages of cluster sampling

Answer 21

May be bias

Question 22

Disadvantages of Stratified sampling

Answer 22

Time consuming

Impractical on large scale

Question 23

Disadvantages of opportunity sampling

Answer 23

May be bias