Unit 1, Ch 2

Question 1

find Z-Score

Answer 1

(x - mean)/std dev.

Question 2

Calculator
Find percentile of z score
normcdf

Answer 2

1. obtain z score
2. 2nd + distr → 2: normal cdf
3. Lower and upper (if infinite, put 1e99 in either one)
4. Mean = 0, StdDev = 1

Question 3

Calculator
Find z score of percentile
invnorm

Answer 3

1. obtain percentile (0 to 1)
2. 2nd + distr → 3:invNorm
3. Area = percentile
4. Mean = 0, StdDev = 1
5. Tail = (depends on problem. Aka which end should calculation start at)