Graphs

Question 1

What are dispersion graphs?

Answer 1

Data is plotted on a vertical scale using dots to show values.

Question 2

When should you use dispersion graphs?

Answer 2

To show the range of values for a single set of data.

Question 3

What are the strengths of using dispersion graphs?

Answer 3

Compare sets of data.

Gives exact data: can easily calculate range; interquartile range and median.

Question 4

What are the weaknesses of using dispersion graphs?

Answer 4

Limited data used

Question 5

What are triangular graphs?

Answer 5

data is plotted on three axes.

Question 6

When should you use triangular graphs?

Answer 6

To show percentage data that has been divided into three but totals 100%.

Question 7

What are the strengths of using triangular graphs?

Answer 7

Shows the division of a total when there are three variables.
Shows large data sets (clustering)
Clearly shows patterns/anomalies

Question 8

What are the weaknesses of using triangular graphs?

Answer 8

Must be percentage data and total 100%

Question 9

What are climate graphs?

Answer 9

a line and bar graph. Line= average monthly temperature. Bar = average monthly precipitation (rainfall).

Question 10

When should you use a climate graph?

Answer 10

To compare climates/change over time.

Question 11

How would you describe a climate graph (rainfall)

Answer 11

Distribution: evenly/unevenly spread
Give the maximum and minimum - which month does it occur in?
Range
Total annual rainfall (add all the rainfall together).

Question 12

How would you describe a climate graph (temperature)

Answer 12

Distribution/max/min and range
Average temperature
Northern hemisphere (warmest in summer) or southern hemisphere (warmest in winter).
Is there a link between temp. and rainfall?

Question 13

What are population pyramids?

Answer 13

Bar chart showing the % of the total population in each 5 year age group

Question 14

When should you use population pyramids?

Answer 14

To show population structure

Question 15

How would you describe population pyramids?

Answer 15

Birth rate: the wider the base the higher the birth rate.
Death rate: straight sides = low; pyramid = high.
Life expectancy: taller the pyramid the higher the life expectancy.
Dependency ratio: dependents ÷independents. Base is widest (0-15)= youthful population/high dependency ratio. Top is widest (65+)= ageing population/high dependency ratio.

Question 16

What are histograms with equal class intervals?

Answer 16

columns for a range of data, area of bar shows frequency, bars do touch.

Question 17

When should you use histograms with equal class intervals?

Answer 17

When data is sorted into ranges ,Height of each bar shows total in each range - the frequency. Continuous data.

Question 18

What are the strengths of using histograms with equal class intervals?

Answer 18

Good for large data sets as can be grouped

Question 19

What are the weaknesses of using histograms with equal class intervals?

Answer 19

Cannot read exact values as data is grouped into categories (number of values within an interval are not actual values)
Can only be used for numerical/ continuous data.
Difficult to compare multiple histograms.