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The proportion of hospitals in Example A of Section 7.2 that had fewer than 1000 discharges is p=.654. Suppose that the total number of hospitials having fewer that 1000 discharges is estimated from a simple random sample of size 25. Use the central limit theorem to sketch the approximate sampling distribution of the estimate.
A market researcher wants to find the 99% Confidence Interval for the average number of hours people spend online each day.
Judy's measured potassium level varies according to the Normal distribution with mean = 3.8. If a single potassium measurement is made, what is the probability that Judy is diagnosed as hypokalemic?
The sample was collected by interviewers going to people's homes in randomly chosen areas in each of the 9 countries. The population represented by this sample was:
The researchers claimed that of those who completed the program, 85% improved. What possible confounds can you identify in this study?
Calculate the difference in the average "clutter" between network and TV.
Suppose that we are interested in the proportion of the 70 students in the lunchroom cafeteria that smokes. Is the normal approximation for the proportion p = r/n valid?
Find out the mean sum of squares of the treatment in one way ANOVA.The profits of individual traders in three departments, labelled by A, B and C, in a medium sized firm were recorded on one day.
To test whether there is significant mean difference between two groups using independent sample t test.
What is a point estimate of the P/E ratio for the population of stocks listed on the New York Stock Exchange? Develop a 95% confidence interval.
The Acme School of Locksmithing has been accredited for the past 15 years. Discuss how this information might be interpreted as a
Suppose we have the following information from a single regression: What is the coefficient of determination? What is the correlation coefficient?
Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacture.
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