Unit 2

Question 1

Frequency

Answer 1

UNIT 2 : Quantity (#) of data in a class

Question 2

Relative Frequency

Answer 2

UNIT 2 : - % of data that falls in a class
- decimal form
- always adds up to 1

Question 3

Z-Score

Answer 3

UNIT 2 : Z = # - mean / SD

Question 4

Empirical Rule

Answer 4

UNIT 2 : 68% of data is between 1 SD above/below mean
95% of data is between 2 SD above/below mean
99% of data is between 3 SD above/below mean

Question 5

Is it Normal?

Answer 5

UNIT 2 : - it says so in the problem
- compare to empirical rule
- normal quantile plot (graph type #6) - linear on quantile plot
- np ≥ 10, n(1-p) ≥ 10