Week 4 Flashcards
What does variance indicate?
Variance indicates the spread of the whole group of scores
It uses every data point
Histograms display … Data in ranges
Continuous
What does a normal distribution look like?
A bell curve
What is normalization?
Allows for the comparison of scores on different kinds of variables by standardising the distribution of scores
What is a z-score?
A z-score describes the position of a raw score in terms of its distance from the mean, when measured in standard deviation units
How do you calculate a z-score?
Data point - mean
Z = ————————–
Standard deviation
What does it mean if the Z-score is positive?
It is above the mean
What does it mean if the z-score is negative?
It is below the mean
What foes it mean if the z-score is close to 0?
It is close to the mean
