Flashcards in Chapter 4 Deck (15):
How do you solve for range?
Largest X minus smallest X
What's the interquartile range?
The range of the middle 50% of the scores
For any set of data, the sum of the deviation scores will always be
If a distribution has a M=50 and s=10, is a score of 65 average?
No. It's above average.
Variability is scores in a sample is usually _______ the variability of the scores in the population from which the sample was obtained.
As variance go up, error goes
A population of scores has a u = 50 and o=10. If every score is multiplied by 2, the new mean and standard deviation scores are..?
u= 100 and o=20
The number of scores that are independent and free to vary is called..?
Degrees of freedom
What's the formula for SS?
SS= €X^2 - (€X)^2/N
How do you calculate o^2 for a population? (variance)
How do you calculate o for a population? (standard deviation)
Square root of (SS/N)
What is o?
What is o^2
How do you calculate o^2 for a sample?