Define a z-score, and explain how it is calculated in the following example: Abby had a score of 75 on a test with a mean of 70 and a standard deviation of 5 . What is her z-score?
What will be an ideal response?
Answer will include that a z-score is a number (a standard score) that tells how many standard deviations above or below the mean score is. To convert an original score to a z-score, we subtract the mean from the score. The resulting number is then divided by the standard deviation for the group of scores. To illustrate, Abby had a score of 75 on the test with a mean of 70 and a standard deviation of 5 . Therefore, 75 minus 70 equals 5, which is divided by the standard deviation of 5 and equals 1 . So, Abby's z-score is +1.0, which means her test score of 75 is one standard deviation above the mean.
You might also like to view...
Which term refers to nonphysical aggression that is intended to hurt another person's psychological well-being?
A. psychological aggression B. instrumental aggression C. relational aggression D. emotional aggression
Which retrieval method is used during an essay test?
What will be an ideal response?
Compare the views of Locke and Rousseau in relationship to the "nature-versus-nurture" debate
What will be an ideal response?
Behaviorists focus on a basic kind of learning called ________
a. instinctive drift b. conditioning c. sublimation d. selective thinking