Lesson 10 - Quantitative Data

Question 1

How can researchers summarise data?

Answer 1

• Working out the measures of central tendency (average)

- Working out the measures of dispersion of spread of scores around the central tendency

Question 2

What is the most useful measure for central tendency and why?

Answer 2

The mean because it takes all scores into account

Question 3

What are the other measures of central tendency?

Answer 3

• Mode

- Median

Question 4

What is the most useful measure of dispersion?

Answer 4

Standard deviation

Question 5

What are the other measures of dispersion?

Answer 5

Range; although it is effected by extreme scores

Question 6

Why is putting data into graphs useful?

Answer 6

It is easier to observe general trends on a graph

Question 7

What graphs are most commonly used?

Answer 7

• Histogram
• Bar chart
• Scattergram / scatter graph

Question 8

What is a histogram used for?

Answer 8

Used when scores can be ordered from low to high

Question 9

What is a bar chart used for?

Answer 9

Used when scores form categories

Question 10

What is a scattergram used for?

Answer 10

Correlational studies

Question 11

What are tables used for?

Answer 11

To summarise data