Study Design

Jill searched the Internet to find comments and reviews from people who owned the type of cell phone she was thinking of buying.

What data collection method was used?

• Observational Study

• Experiment

• Survey

• Simulation

Steven observed students entering a classroom for class and recorded whether the first half of the students who arrived for class chose to sit in the front half of the room.

What data collection method was used?

• Observational Study

• Experiment

• Survey

• Simulation

A researcher stood at a school parking lot entrance to see if the color of a car is related to the driver not wearing a seat belt.

Which research method is most appropriate?

• Observational Study

• Experiment

• Census

• Correlation

Four groups of randomly selected people are assigned a different diet. After six months, the blood pressures of each group are compared.

Which research method is most appropriate?

• Observational Study

• Experiment

• Census

• Sample Survey

A psychologist designed a study to test the effects of cell phone use on driving safety. Participants were randomly assigned either to drive an automobile simulator while talking to a friend on a cell phone or to drive a simulator without talking on a phone.

Which type of research does the scenario describe?

• Census

• Observational Study

• Sample Survey

• Experiment

Identify the sampling design: School admin conducted a survey on post-graduation plans.  Students of senior class 2018 were listed in order by class rank.  The school selected a random number between 1 and 15, obtaining a number 11.  Then, they selected every 11th student for the survey.

• cluster
• volunteer
• systematic
• simple random

Identify the sampling design: Student government randomly samples 25 students of each of the four classes.

• stratified
• volunteer
• systematic
• simple random

Units of the population are grouped; one or more groups are selected at random.  All units of that group are included in the sample.

• cluster sample
• simple random
• stratified
• proportional

A teacher wants to know how well her students are doing on a topic. She randomly picks one class to survey.

• Simple Random

• Cluster

• Stratified

• Systematic

Political webpages often allow readers to rate (if they want to) whether they strongly agree, agree, disagree, or strongly disagree with the President's decision on any given situation. This is a form of:

• Volunteer Response

• Convenience Sampling

• Simple Random Sampling

• Systematic Random Sampling