1.2 & 1.6 Introduction to Statistics

Determine whether the given data are discrete or continuous: How many cars are on the highway.

• Discrete

• Continuous

Determine whether the given data are qualitative or quantitative: Age

• Quantitative

• Qualitative

Determine whether the given data are discrete or continuous: The speed of a vehicle.

• Discrete

• Continuous

What is population?

• subjects actually measured or surveyed

• the entire group of individuals about which we want to learn

What is the sample?

• A subset of a population

• A type of experiment

Determine the sampling method for the following case: A researcher is conducting a study of students’ attitudes toward community service. He takes a list of all 12,242 students and uses a random number generator to select 30 students whom he emails to complete the survey.

• Simple Random Sampling

• Systematic Sampling

• Convenience Sampling

• Stratified Sampling

Answer explanation

This researcher used simple random sampling because participants were selected from the overall population in a way that each individual had an equal chance of being selected.

​A(n) _______is obtained by dividing the population into groups and selecting all individuals from within a random sample of the groups.

• Simple Random Sampling

• Systematic Sampling

• Stratified Sampling

• Cluster Sampling

Determine the sampling method for the following case: To determine customer opinion of their food quality, Food4Less randomly selects 120 city blocks during a certain week and surveys all homes within the city blocks.

• Simple Random Sampling

• Stratified Sampling

• Cluster Sampling

• Systematic Sampling

To determine her blood sugar level​, Carrie divides up her day into three​ parts: morning,​ afternoon, and evening. She then measures her blood sugar level at 3 randomly selected times during each part of the day. What type of sampling is used?

• Stratified

• Cluster

• Simple Random

Determine the sampling method for the following case: Microsoft wants to administer a satisfaction survey to its current customers. Using their customer​ database, the company randomly selects 80 customers and asks them about their level of satisfaction with the company.

• Simple Random Sampling

• Stratified Sampling

• Cluster Sampling

• Systematic Sampling