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An admissions officer has determined that the population of applicants to the MBA program has undergraduate GPA' that are approximately normally distributed with standard deviation 0.45. A random sample of…
Six soil samples taken from a particular region were subjected to chemical analysis to determine the pH of each sample, yielding a sample mean pH of 5.9 and a sample…
The true proportion of defective memory chips produced by a certain company is p. Suppose a random sample of 400 memory chips are tested and 10 of them are found…
How many people should be surveyed if we want to estimate the proportion of students who prefer using the test center? Assume we want 90% confidence we are within 5%…
In an investigation of pregnancy induced hypertension, one group of women with this disorder was treated with low dose aspirin, and the second group was given a placebo. A sample…
Let p1 and p2 be the respective proportions of women with nutritional anemia in each of two developing countries. If a random sample of 200 women from the first country…
In a sample of 77 southern cities, it was found that 49 had republican controlled city councils. Determine the UPPER bound of the 95% confidence interval for the proportion of…
Researchers at the University of South Florida conducted a study of drug usage of U.S. physicians. The anonymous survey of 5,430 randomly selected physicians revealed that 429 experienced substance abuse…
An advertising company wishes to estimate the population mean of the distribution of hours of television watched per household per day. Suppose that the population standard deviation of hours watched…
A production process fills containers by weight. Weights of containers are approximately normally distributed. Historically, the standard deviation of weights is 5.5 ounces. (This standard deviation is therefore known.) A…
