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To obtain a 95% confidence interval for the proportion of all students at the university favoring the honor code which is 58%, what is the minimum sample size needed if the total width of the confidence interval must be less than 5 percentage points?
Write a hypothesis about the length of words in newspapers and magazines, Design and carry out an investigation to test your hypothesis.
Given are the numbers of times the machine was used over each of the last 30 days. Find out the mean number of times the machine was used per day.
One school found that 28.6% of all students are liberal. You wonder whether this percentage is different at your school, but don't know whether it's higher or lower. What hypotheses will you test to see if your school significantly differs from th..
Two teams of workers assemble automobile engines at a manufacturing plant. Quality control personnel inspect a random sample of the teams assemblies and judge each assembly to be acceptable or unacceptable.
joint pmf p(X1,X2)=(X1+2X2)/18, (x1,x2)=(1,1),(1,2),(2,1),(2,2), zero elsewhere. Determine the conditional mean and variance of X2, given X1=x1, for x1=1 or 2. Also compute E(3X1-2X2).
What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)?
A researcher wants to collect data about the study habits of sophomores at Harmond University. From the sophomore class of 2,300 students, she wants to collect a sample of 70 students. Which of the following sampling methods will yield the most re..
The company sells Mr. Brophy an insurance policy and he has an accident. What's the probability of Mr. Brophy being a good, medium or poor driver?
Evaluate the data below using the Kruskal - Wallis Nonparametric Hypothesis Test. Explain why you chose this particular nonparametric test to analyze your data.
Construct a 99% confidence interval on the difference of the average ages for the viewers of the two TV programs. How can you interpret this interval?
Given the following frequency distribution, find out the mean, variance, and standard deviation.
Madison Metals recently reported $9,000 of sales, $6,000 of operating costs other than depreciation, and $1,500 of depreciation. The company had no amortization charges and no non-operating income.
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