Curving
The Normal Curve
Z scores
T scores & SAT scores
100
If a student earns a 45 on a test, but it is the highest score in the class, what letter grade would the student receive after a curve?
A
100
This is the percent of normally distributed scores within 1 standard deviation.
68
100
This is the Z score formula.
100
Z = -1, find the T score.
40
200
Every student in a class scores in the 90s on a quiz, but one student scores 89. What is the curved score, as a letter grade?
F
200
95% of normally distributed scores fall within this many standard deviations.
2
200
A student earns an 82 on a test and a Z score of zero. What was the mean?
82
200
PSAT scores were formerly represented with this type of score.
T score
300
It is bell-shaped and symmetric
The Normal Curve
300
This is the percent of scores between the +1 SD and +2 SD on the normal curve.
13.5%
300
SAT = 800, find the Z score.
+3
300
List 3 types of standard scores
Z scores, T score & SAT scores
400
A college sets a policy that professors must curve and only students who earn above +2 SD receive an A. What percent of students earn an A?
2.5%
400
A set of scores are normally distributed. The mean and standard deviation are unknown. What percent of scores lie above the mean?
50
400
To determine a Z score given a raw score, the standard deviation. This is the formula for standard deviation.
400
A student's raw score = the class mean. Find the SAT score.
500
500
When does curving hurt a student's score?
When they did well or average, but worse than most of the class.
500
In a class of 100 students, this is the percentile of the student who earned the highest score on a test.
99th
500
T = 30, find Z using mental math (no calculator, no written work -- just write the answer).
Z = -2
500
This is the standard deviation for T scores
10