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Question: An economist wants to find a 90% confidence interval for the mean sale price of houses in a state. How large a sample should she select so that the estimate is within $3500 of the population mean? Assume that the standard deviation for the sale prices of all houses in this state is $31,500.
The data for 13 intersections in Fairfax County, Virginia, are given in the table. Analyze the data for the VDOT. What do you conclude?
What is the probability that all three missiles miss?- How many missiles would have to be fired at the plane in order to be 99.99% sure it would be hit?
In a random sample of 80 items, the defect rate is 5% but the manager claims that this is only a sample fluctuation and production is not really out of control. At the 0.01 level of significance, does the data provide sufficient evidence that the ..
if we are testing for the difference between the means of 2 related populations with samples of n1 20 and n2 20 the
Here is a bar chart summarizing the 2005 movie genres, as seen in the pie chart.- Which genre was most common?- Is it easier to see that in the pie chart or the bar chart? Explain.
The data given below are taken from two independent samples collected randomly. What is the value of test statistics?
a national survey of 40000 adults in the us in 1992 found that 26 of adults were current smokers. a similar survey of
a company is studying the number of monthly absences among its 125 employees. the following probability distribution
suppose y is the daily revenue for some company where ey 10000 andvary 2540000 and sigmay 734.85.a if y is normally
Use the Internet to find a website that shows an example or application correlation or regression in the area of your interest or in your profession. Discuss how correlation or regression was used and summarize your finding.
An urn contains 8 balls identical in every respect except color. There are 4 blue balls, 3 red balls, and 1 white ball.
Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution.
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