Identify the experimental units and treatments used in the experiment.
18) A medical researcher center wants to test the effectiveness of a new diabetes medication. The company identifies 82 adults suffering from a similar form of diabetes. The subjects are randomly assigned to two groups. One group is given a medication and the other is given a placebo that looks exactly like the medication. After three months, the subjects' symptoms are studied and compared.
Identify the population and the sample.
19) A survey of 1782 American households found that 80% of the households own a computer.
20) When 1886 American households were surveyed, it was found that 85% of them owned two cars.
21) A survey of 2625 elementary school children found that 28% of the children could be classified as obese.
Provide an appropriate response.
22) If you had to do a statistical study, would you use a sample or a population? Why?
23) Explain what bias there is in a study done entirely online.
24) Explain the differences between the interval and ratio levels of measurement.
25) Explain the differences between cluster sampling and stratified sampling.