Ch 4 Vocab Review

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 seatbelt.

• Observational Study

• Experiment

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

• Observational Study

• Experiment

Marianne wanted to know students' opinion on the new schedule at school. She survey's the first 30 students who come into her class.

• Convenience Sampling

• Systematic Random Sampling

• Simple Random Sampling

• Volunteer response

A ___ is a large group that includes everything being studied.

• Sample
• Stratified Sampling Method
• Population
• Voluntary-Response

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

unmedicated treatment made to look like the real treatment

• control

• experimental

• placebo

occurs when an experimenter cant tell the difference between the effects of different factors on a variable

• confounding variable

• blinding

• census

• bias

occurs when the subject does not know if they are receiving the treatment or placebo

• confounding variable

• blinding

• census

• bias

occurs when one outcome is favored over another

• confounding variable

• blinding

• census

• bias

Sources of variation in an experiment that are planned.

• extraneous variables
• factors
• treatments
• blinding