What is bivariate data?
Bivariate data two categories of data (such as height and weight) taken from the same group
What two conditions does data need for calculating the PMCC
Data must be bivariate, data must be normally distributed
What is the null hypothesis
The hypothesis we think will occur
What is the alternate hypothesis
The other hypothesis that it could be
How do you write the null hypothesis for PMCC
Ho: p=0
How do you write the alternate hypothesis for PMCC
H₁: p≠ 0
What should you be careful with when writing hypotheses
There must be a colon not an equals sign
What should you also annotate
where p= the correlation coefficient of the parent population
What does a lower significance value mean
The evidence to support or reject a correlation is more likely to be correct because having a lower significance value mean there are harsher conditions for a hypothesis to be rejected or not rejected
What is the null hypothesis for a chi-squared contingency table?
There is no association between (context of the question)..
What is the null hypothesis for a chi-squared goodness of fit?
The data can be modelled using (the type of distribution from the question)
What two rules of chi-squared tests are important?
Minus another degree of freedom if a value has been estimated (calculated, e.g. the probability of a distribution)
If the expected frequency is less than 5, then two categories must be combined
How to find degrees of freedom?
Subtract all values in the last row and the last column of the table, count remaining values to give degrees of freedom (one less than the categories for a contingency table)
