In a cluster random sample with equal-sized clusters, every subject has the same chance of selection. However, the sample is not a simple random sample. Explain why not.
Answer to relevant QuestionsYou plan to sample residents of registered nursing homes in your county. You obtain a list of all 97 nursing homes in the county, which you number from 01 to 97. Using random numbers, you choose five of the nursing homes. ...Excessive cumulative exposure to ovarian hormones is believed to cause breast cancer. A study (New England J. Medic. 2003; 348: 2313–2322) used information from 1811 pairs of female twins, one or both of whom had breast ...A randomized clinical trial is planned for AIDS patients to investigate whether a new treatment provides improved survival over the current standard treatment. It is not known whether it will be better or worse. a. Why do ...In Example 8 about Down syndrome, we estimated the probability of a positive test result (predicting that Down syndrome is present) to be P(POS) = 0.257, based on observing 1355 positive results in 5282 observations. How ...Do you find it hard to believe that the probability of at least one birthday match in a class of 25 students is 0.57? Let’s simulate the answer. Using the Random Numbers applet on the text CD, each student in the class ...
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