In Chapter 7, we are learning about probability sampling methods. In the text, there are several examples of the five types of probability sampling methods – simple random, systematic, stratified, cluster and resampling.
For this discussion topic, find a journal article that describes the use of one of these probability sampling methods. Answer the following questions:
In Chapter 9, we are learning about hypothesis testing and Type I and Type II errors. Consider the following scenario:
An auto parts company advertises that its special oil additive will make the engine “run smoother, cleaner, longer, with few repairs.” An independent laboratory decides to test part of this claim. It arranges to have a taxi-cab company’s fleet of 100 cars use the additive, and follows them to see if how many need repairs. At the end of a year, the laboratory will compare the percentage of cars that need repairs to the historical repair percentage.
For this scenario, answer three of the following questions:
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