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Suppose that a random sample of ten recently sold houses in a certain city has a mean sales price of $285,000, with a standard deviation of $13,000. Under the assumption that house prices are normally distributed, find a 95% confidence interval for the mean sales price of all houses in this community.
a) What is the lower limit of the confidence interval?
b) What is the upper limit of the confidence interval?
The English Department wants to know whether there is a difference in the proportions of female students taking Eng 110 and Eng 100 courses. Samples are collected from each class: Eng 110 sample found 16 out of 29 students in class and Eng 100 ..
Your firm has classified orders as either large or small in dollar amount and as either light or heavy in shipping weight. In the recent past, 28% of orders have been large dollar amounts
The following information was obtained from two independent samples selected from two normally distributed populations with unknown but equal variances.
What is the appropriate set of hypotheses to test such that a possible outcome of the test would indicate;
Academic degrees and gender. Here are the projected numbers (in thousands) of earned degrees in the United States in the 2010-2011 academic year, classi?ed by level and by the sex of the degree recipient:28
the wayne manufacturing company purchases a certain part from suppliers a b and c. suppler a supplies 65 of the parts b
What is the required sample size if you need to estimate the number of workers in the United States who are highly satisfied with their job and you want the estimate to be within 2 percentage points of a 96% confidence interval.
For the product measure λ × λ on R2, the usual Lebesgue measure on the plane, it's very easy to show that rectangles parallel to the axes have λ × λ measure equal to their usual areas, the product of their sides. Prove this for rectangles that are..
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
It took a contractor 5000 hours to manufacture their first unit of an item. If the contractor expects to achieve a 94% unit learning curve, how many hours would be required to manufacture units 76-100?
In a representative sample of 1000 adult Americans, only 420 could name at least one justice who is currently serving on the U.S. Supreme Court. Using a significance level of 0.01, carry out a hypothesis test to determine if there is convincing ev..
These show an average yield of 850 boxes of fruit, with a standard deviation of 100 boxes. Give a 95% confidence interval for m, the average (10-acre) yield for all groves utilizing such a maintenance spraying program. Assume that s can be replace..
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