10.6 : Representing Variation Graphically Flashcards
Define discontinuous variation
A characteristic that can only result in certain values - no in between values
Is variation determined by genetic factors continuous or discontinuous ?
Discontinuous
What can you use to represent discontinuous variation?
Bar chart
Pie chart
Define continuous variation
A characteristic that can take any value within a range
What influences / causes continuous variation?
Not a single gene, but a number of genes ( poly genes )
Environmental factors
What can be used to represent continuous data?
Collected in frequency table
Potted on histogram
List the characteristics of a normal distribution curve
Mean, mode and median are the same
Bell shape, symmetrical around the mean
Most values lie close to mean value, number at extremes is low
50% of values less than mean,50% greater than mean
What is standard deviation?
A measure of how spread out the data is
What statistical tests can be performed to determine the significance of data collected?
T test - compares means of two populations
Spearman’ rank correlation coefficient - considers relationship between two sets of data
Do worked examples of statistical tests ok?
Ok
