Stats Flashcards
What is the population?
All the individual items that can be sampled
What is a sample?
A selection of the population
What is a sample unit?
An individual
What is data?
Observations collected
What is continuous data?
Data which can take infinite values
What is discontinuous data?
Data which can take limited values
What is parametric data?
Data which is; normally distributed, whose populations do not affect each other and whose variances in populations are similar
What is non-parametric data?
Data which doesn’t meet the 3 assumptions of parametric data
When is data negatively skewed?
When mean
When is data positively skewed?
When mode
What is the variance of data?
How spread sample units are from each other
What is the standard deviation of data?
How spread sample units are from the mean
What data is used when performing a t test?
Parametric
What is the difference between a paired and an unpaired t test?
Paired = when there is a relationship between populations Unpaired = when there is no relationship between populations
What is the difference between a one tailed and a two tailed t test?
One tailed = testing for a significant difference in one direction
Two tailed = testing for a significant difference in either direction
