Observational Studies and Designed Experiments Part 2

What is the explanatory variable in an observational study?

• The input variable

• The output variable

• The lurking variable

• The control variable

What is the response variable in a designed experiment?

• The input variable

• The output variable

• The lurking variable

• The control variable

What is a lurking variable?

• A variable that affects both the explanatory and response variables

• A variable that is controlled in a designed experiment

• A variable that is observed in an observational study

• A variable that has no effect on the relationship between variables

In the study about pregnant women and lobster, what is the lurking variable?

• Money

• Lobster

• Health

• Doctor visits

In the study about firefighters and property damage, what is the lurking variable?

• Fire

• Firefighters

• Property

• Emergency response time

In the study about ice cream cones and drownings, what is the lurking variable?

• Temperature

• Ice cream cones

• Beach visitors

• Water safety measures

Is the study about children's shoe size and reading ability an observational study or a designed experiment?

• Observational study

• Designed experiment

• Both

• Neither

Can we conclude from the study about children's shoe size and reading ability that longer feet cause better reading ability?

• Yes, as it is an observational study

• No, as it is not a designed experiment

• It depends on the size of the shoe

• It depends on the age of the children

What is the explanatory variable in the study about positive thoughts and catching a cold?

• Positive thoughts

• Duration of the cold

• Number of volunteers

• Rhinovirus injection

Is the study about zinc nasal spray and reducing the duration of a cold an observational study or an experiment?

• Observational study

• Experiment

• Both

• Neither