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Question: Suppose that a population is known to be normally distributed with μ = 2,000 and σ = 230. If a random sample of size n = 8 is selected, calculate the probability that the sample mean will exceed 2,100.
in a very large population the distribution of annual income is skewed with a long right tail. we take a simple random
The weekly salaries one year after graduation are normally distributed with a standard deviation of $85. If one graduate is randomly selected. Describe the distribution of the weekly salaries being earned one year after graduation.
Construct a scatter plot of these data. Describe the relationship between these two variables.- Compute the sample correlation coefficient. Does this value support your answer in part (a)? Why or why not?
assume that as a newspaper reporter you must graph data showing that increased smoking causes an increased risk of lung
You work for a local construction firm, "DeVry Engineering Group" and your supervisor wants to test your knowledge and skills with Microsoft Excel and has instructed you to develop a spreadsheet to calculate weekly payroll for "15" employees with ..
Find a 95% confidence interval for the population proportion of males who do not donate blood who have heart disease.
Explain exactly how you interpret regression coefficients if logs are taken only of Y, only of the Xs, or of both Y and the Xs.
If the computed value of F is 5.01 and the critical value is 2.67, we would conclude that all the population means are equal. Unlike student’s t distribution, there is only one F distribution.
It is very difficult for small businesses to be successful. The Small business administration estimates that 20 percent will dissolve or go bankrupt within two years. A sample of 50 new businesses is selected. (show work) (a) What is the mean and ..
Does this data provide evidence at the .05 significance level that there is a difference in the proportion of humorous ads in British versus American trade magazines?
A parent is deciding which babysitter to use in the neighborhood. Babysitter A charges $20 per hour and a base rate of $60 per day. Babysitter B charges a base rate of $50 per day and $25 per hour.
What is the percentile rank for someone who got 350 points and what percentage of students had between 275 and 375 points?
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