Maths and Stats Flashcards
How to work out degrees of freedom?
Number of samples - 1
When do we use the chi squared test?
To see how closely experimental results fit expected results
What type of data uses the chi squared test?
Categorical
What is the relationship between the chi squared value and how closely experimental results fit expected results?
The larger the value of Chi-squared, the more certain we can be that there is a difference between the observed and expected results
If the statistical test value is higher than the critical value…
We reject the null hypothesis
What is student t test used for?
To see if there is a significant difference between two mean sets of data
What happens if the t value is negative?
Ignore the negative sign and turn it into a positive
If the t test value is higher than the critical value…
There is a significant difference between 2 sets of data
What is Spearman’s rank/correlation coefficient used to test for?
The relationship between two variables where the data are not normally distributed.
What order is data ranked in in Spearman’s rank?
Starting from one, highest to lowest
If the calculated value for the correlation coefficient is greater than the critical value…
…there is a strong positive/negative correlation between the two sets of data
How many micrometres in a centimetre?
10,000
How many nanometres in a centimetre?
10,000,000
If the chi squared value is bigger than the critical value…
Significant difference between observed and expected results - something other than chance causing difference
If chi squared value is smaller than critical value in genetics…
…no significant difference between observed and expected results, data supports theory gene is controlled by monohybrid inheritance
