Determine whether the following depicts an observational study or an experiment: 1. Forty patients with skin cancer are divided into two groups. One group receives a drug to fight... Determine whether the following depicts an observational study or an experiment: 1. Forty patients with skin cancer are divided into two groups. One group receives a drug to fight cancer, the other group receives a placebo. After two years, the spread of the cancer is measured. 2. While shopping, 250 people are asked to perform a taste test in which they drink two randomly placed, unmarked juices. They are then asked which juice they prefer. 3. What type of sampling is used in the following: Toshiba wants to administer a satisfaction survey to its current customers, randomly selecting 30 customers and asking them about their level of satisfaction with the company.
Understand the Problem
The question is asking to classify the scenarios provided as either observational studies or designed experiments. It also requests to identify the type of sampling used in a specific example.
Answer
1. Designed Experiment 2. Designed Experiment 3. Simple Random
- Designed Experiment 2. Designed Experiment 3. Simple Random
Answer for screen readers
- Designed Experiment 2. Designed Experiment 3. Simple Random
More Information
An experiment actively manipulates variables (like giving a drug), while an observational study simply observes. Random selection indicates simple random sampling.
Tips
Confusing observational studies with experiments is common. Observational studies do not involve intervention.
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