how do you calculate the standard deviation? - answer✔✔1. table of data
2. calculate mean
3. subtract mean from each number in sample (X-x ̅)
4. square (X-x ̅)
5. add all the squared numbers together
6. divide the sum by n-1 to give variance
7. square root the variance
What is a parametric test? - answer✔✔A test that assumes the populations drawn from are
normally distributed
What is a non-parametric test? - answer✔✔Distribution free tests, used when assumptions are
not met:
Data does not come from a normal distribution
Variances are not assumed to be the same in different groups
Data is nominal or ordinal
Assumptions of ANOVA cannot be met
how do you choose to carry out spearman's rho? - answer✔✔must have correlation
how do you choose to carry out binomial sign? - answer✔✔experiment
repeated measures
nominal
how do you choose to carry out wilcoxon? - answer✔✔experiment
repeated measures
ordinal or interval data
how do you choose to carry out chi-squared? - answer✔✔experiment
independent groups
nominal
how do you choose to carry out mann whitney - answer✔✔experiment
independent groups
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