Maths skills Flashcards
What does chi squared determine?
The difference between the frequencies of different groups
How do you calculate degrees of freedom for chi squared?
n - 1 (number of categories - 1)
What does the correlation coefficient determine?
The correlation between two different variables
How do you determine the degrees of freedom for correlation coefficient?
There isn’t one. The number of categories is the degrees of freedom
What does the student t-test determine?
It looks at the difference between two means
How do we calculate the degrees of freedom for t tests
(n1 + n2) - 2
What does it mean when the calculated value is greater than or equal to the critical value?
If the calculated value is greater than the critical value, there is a less than 5% probability that the difference in the results is due to chance therefore, we can reject the null hypothesis
What does it mean when the calculated value is less than the critical value?
If the calculated value is less than the critical value, this means there is a greater than 5% probability that the results are due to chance and therefore, we can accept the null hypothesis?
How to convert between nm, μm, mm, km?
Divide or multiply by 1000
How to calculate the rate if a reaction?
Rate = 1/time
How to calculate the rate if reaction when determine how much something has changed over time?
Rate = change/time
What are the units for breathing rate?
min-1
How to calculate uncertainties?
Smallest increment of measurement and divide by 2. Add a ± sign
How to calculate the percentage error?
(uncertainty value/measurement) x 100
Calculate the rate on a slope?
Change in y/change in x
