GW 5 Flashcards
What is another name for z score?
Standard score
What are the 2 purposes of the z-score?
To identify the exact location of each score and to standardize the distribution.
What does it mean to standardize a distribution?
To take different distributions and make them equivalent
What is the formula for finding z-score?
x minus mean over standard deviation
How do you find the deviation score?
x minus mean
What happens to the shape of a distribution once scores are converted to z scores?
It stays exactly the same
What is the formula to convert a z-score back into an x-value?
x=mean plus z score times standard deviation
What are the SAT and IQ tests examples of?
Standardized scores
What exactly is a deviation score?
How much a score deviates from the mean
What exactly is standard deviation?
The average amount a score deviates from the mean
What is the mean of a z-score distribution?
0
What is the standard deviation of a z-score distribution?
1
What can we conclude if there are extreme z-scores in a sample?
That the treatment worked
If the sample is noticeably different than the population, what can we conclude inferentially?
That the treatment had an effect
What is considered an extreme z score?
Beyond -2 or +2
