Justify for all answers so I can understand better

2. Choose the best answer. Justify for full credit.

(Part A ) The hotel ratings are usually on a scale from 0 star to 5 stars. The level of this

measurement is

(i) interval

(ii) nominal

(iii) ordinal

(iv) ratio

(Part B) In a career readiness research, 100 students were randomly selected from the

psychology program, 150 students were randomly selected from the communications

program, and 120 students were randomly selected from cyber security program. This

type of sampling is called:

(i) cluster

(ii) convenience

(iii) systematic

(iv) stratified

3. True or False. Justify for full credit.

(a) If the variance from a data set is zero, then all the observations in this data set must be

identical.

(b) The median of a normal distribution curve is always zero.