Please help answer the following multiple choice questions.
Problem 1: Which of the following sampling techniques can assure that the profile of the sample matches the profile of the population?
- Simple random sampling
- Systematic sampling
- Cluster sampling
- Stratified sampling
Problem 2: Which of the following types of level measurement describes variables that have equal intervals and a value of zero?
- Interval
- Ordinal
- Ratio
- Nominal
Problem 3: Which coefficient reflects the occurrence of perfect reliability?