L9: Z Scores And Stuff Flashcards
1
Q
Outline z-scores/standard scores
A
-Allow us to compare values from different data sets (when we know the mean and standard deviation of the population
-it is the number of standard deviations that the observation deviates from the mean
_
z= (x-x)/standard deviation
2
Q
Standardising all values of a normal distribution turns it into a……
A
Standard Normal distribution (which have a mean of 0 and a variance of 1)
3
Q
Define the alpha level/significance level
A
The probability of rejecting the null hypothesis when you should accept it
