Assume that the population proportion of all business professionals who select a
ID: 2957870 • Letter: A
Question
Assume that the population proportion of all business professionals who select an airline based on price is 0.27. A random sample of 325 business professionals is to be taken for further study.
A) What is the shape, mean, and standard deviation of the sampling distribution of the sample proportion for samples of size 325.
B) What is the probability that our sample of 325 results in a sample proportion that falls within 4 percent of the population value ( ± .04)?
Health Insurers are putting pressure on hospitals to reduce the average "length of stay" of their patients. A random sample of 20 hospitals in one state had a mean "length of stay" for women of 3.8 days, and a standard deviation of 1.2 days. Compute, and explain, a 90% confidence interval estimate of the population mean "length of stay" for women in that state.
Two percent (.02) of the items produced by a machine are defective. A random sample of 40 items is selected and checked for defects.
A) what is the probability that the sample will contain 5% or more defective items?
Explanation / Answer
A) shape: Normal, mean: 0.27, SD = sqrt(0.27*0.73/325) = 0.025 B) normalcdf(-.04/.025,.04/.025) = 0.8904 ############## 3.34Related Questions
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