standard normal distribution

Question 1

normal distribution model

Answer 1

bell curve
*2 important parameters - mean/SD
*mean in middle
*every other number (value) is a SD away from the mean

Question 2

z-score

Answer 2

the number of SDs a value is away from the mean
*equal to (x-M)/SD

x - a value
M - the mean

Question 3

finding x (using a normal model)

Answer 3

x = M + z(SD)

z - z-score

Question 4

empirical rule

Answer 4

*68 % of values lie within 1SD away from the mean
*95% of values lie within 2SDs away from the mean
*99.7% of values lie within 3SDs away from the mean

*the probabilities of values ending up within those areas

Question 5

the area under the bell curve corresponds to…?

Answer 5

the probability that a value will lie in that area