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What does standard deviation represent?
spread of data around the mean
How do you calculate the mean?
add up all numbers and divide them by how many there are
How do you calculate the mode?
most common value
How do you calculate the median?
middle value
What does a thin and fat curve mean for SD?
What is the formula for SD?
What does it mean if SD bars overlap?
differences in the means aren’t significant
What does Chi squared test for?
testing for differences between categories
What is the formula for CS?
Use this example to work out CS
What is “the golden truth”?
if the calculated value is more than/less than the critical value
We reject/accept the null hypothesis
The probability that the difference in the categories are due to random chance is less than/more than 5%
The difference in categories is/isn’t significant
What is spearman’s rank? (Correlation coefficient)
testing for a correlation between two variables
Use SR to work this example out
What is “the golden truth”?
if the calculated value is more than/less than the critical value
We reject/accept the null hypothesis
The probability that the correlation is due to random chance is less than/more than 5%
The difference in categories is/isn’t significant
What is a T-test?
testing for differences between mean values
What is the formula for the T-test?
Work out this example
What is “the golden truth”?
if the calculated value is more than/less than the critical value
We reject/accept the null hypothesis
The probability that the difference in the means are due to random chance is less than/more than 5%
The difference in categories is/isn’t significant
