LC 4.26.23 Analytical Epidemiology

A study took random sample of adults and asked them about their bedtime habits. The data showed that people who drank a cup of tea before bedtime were more likely to go to sleep earlier than those who didn't drink tea.

• Observational Study

• Experimental Study

Another study took a group of adults and randomly divided them into two groups. One group was told to drink tea every night for a week, while the other group was told not to drink tea that week. Researchers then compared when each group fell asleep.

• Observational Study

• Experimental Study

A study randomly assigned volunteers to one of two groups:

One group was directed to use social media sites as they usually do. One group was blocked from social media sites.

The researchers looked at which group tended to be happier.

• Observational Study

• Experimental Study

Another study took a random sample of people and examined their social media habits. Each person was classified as either a light, moderate, or heavy social media user. The researchers looked at which groups tended to be happier.

• Observational Study

• Experimental Study

Tags

NGSS.HS-LS3-3

The experimental group is:

• Study in which neither the experimenter nor the subjects know if the subjects are in the experimental or control group

• study in which the subject do not know if they are in the experimental group or control group

• subjects in an experiment who are not subjected to the independent variable and may receive a placebo treatment

• the group to which the researchers manipulate the independent variable

In an experiment, it is the group that is not exposed to the treatment contrasts with the experimental group and serves as a comparison for evaluating the effect of the treatment.

• group of participants

• matched pairs group

• experimental group

• control group

The experimental factors that is manipulated.

• Control variables

• experimental conditions

• independent variables

• dependent variables

The outcome factor the variable that may change in response to manipulations of the independent variable.

• extraneous variable

• dependent variable

• independent variable

• control variable

Tags

NGSS.MS-LS1-5

In an experiment, the _________________ variable is tested by the researcher to observe its effect(s) on the _________________ variable.

• A.independent; dependent

• B.first; second

• C.dependent; independent

• D.research; results

This approach is when the researcher is asking the participant about past behavior.

• prospective

• field

• retrospective

• laboratory