Question

section 1.3: you may see the same question twice, because the scenarios are randomly selected. classify a statistical study as either an observational or a designed experiment. statistical study a clinic gives a drug to a group of ten patients and a placebo to another group of ten patients to find out if the drug has an effect on the patients illness. a political pollster reports that his candidate has a 10% lead in the polls with 10%undecided. question help: video message instructor

Explanation:

1. In the first case, the clinic manipulates the treatment (drug vs placebo) given to different groups of patients. This is a designed experiment as the researchers are actively controlling variables to observe an outcome.
2. In the second case, the political pollster is simply observing and reporting the existing opinions of the voters as found in the polls. There is no manipulation of variables, so it is an observational study.

Answer:

1. Designed experiment
2. Observational study