10.6 Representing Variation Graphically

Question 1

Based on data collected wen studying variation characteristics are sotes into this that show what

Answer 1

Discontinuous variation snd contiuous variation

Question 2

discontinuous variation

Answer 2

A characteristic tha can only result in certain discrete categories eg blood group,bacteria shape
Variation determined purely by genetic factors
Usually represented using bar charts or pie charts

Question 3

Continuous variation

Answer 3

A characteristic that can take any clause within a range eg height
Characteristics that show this variation are not controlled by a signal gene but a number of genes
Data are collected in frequency table then plotted on a histogram

Question 4

When continuous variation data is plotted what does it usually result in

Answer 4

Production of bell shaped curve
Normal distribution curve

Question 5

Characteristics of normal distributions

Answer 5

• mean mode and median are the same
• 50 % of values less then mean 50% greater then mean
• most value lie close to mean value

Question 6

What is standard deviation

Answer 6

It is a measure of how spread out the data is
The greater the standard deviation the greater the spread of the data

Question 7

In terms of variation a characteristic with a high standard deviation means

Answer 7

They it has a large amount of variation

Question 8

Students t Test

Answer 8

Is used to compare the mean values of two sets of data
To use this test the data collected must be normally distributed

Question 9

Spearman’s rank correlation coefficient

Answer 9

Used to consider the relationship of between two sets of data