Z Score
What is a Z score?
The number of standard deviations a value lies away from the mean
P represents what in a binomial?
P represents the probability of the event of interest occuring
Given a normal distribution, what is the probability a z score will be in between 1.1 and 3.5?
.1354
If a z score is negative, what does this imply?
it lies below the mean
N in binompdf represents what?
N represents the number of items/individuals in the sample
.314Given a normal distribution, what is the probability a z score will be in between 0 and 1?
.3413
If a z score is over 1, what does this imply?
The value we are calculating the z score for is over one standard deviation away from the mean
X represents what in the binompdf formula in a calculator?
X represents successes we are examining.
Given a normal distribution, what is the probability a z score will be in between -1.1 and 2.34?
.8547
interpret a z score of 1.1
The value we calculated the z score for lies 1.1 standard deviations above the mean
The probability of guessing a question correctly is 1/4 (multiple choice). Assume the quiz has 13 questions. If we are testing the probability of getting 7 correct, what is P, X, and N
P= .25, X= 7, N= 13.
Given a normal distribution, what is the probability a z score will be in between -.032 and 1.7?
.4682
When calculating the area in between two z scores in a calculator using normalcdf, the mean is ____ and the standard deviation is ____
0, 1
The probability of guessing a question correctly is 1/4 (multiple choice). Assume the quiz has 13 questions. What is the probability of getting 7 correct by guessing?
binompdf(13, .25, 7) =.0186
Given a normal distribution, what is the probability a z score will be in between -2.56 and 1.25?
.8891