Identify each of the following designs as being an observational study or an experiment. If the study is an observational study, state whether is retrospective or prospective. If the study is an experiment, identify the explanatory and response variables.

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Identify each of the following designs as being an observational study or an experiment. If the study is an observational study, state whether is retrospective or prospective. If the study is an experiment, identify the explanatory and response variables.


1. A researcher wants to test the effectiveness of a new pill that lowers blood pressure. The researcher gives the pill to half the patients who have volunteered for the study, and gives a placebo pill to the other half. The blood pressure of each group is measured at the end of the study to assess the effectiveness of the new drug.

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