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Suppose that the distribution of IQ's of North Catalina State University's students can be approximated by a normal model with mean 130 and standard deviation 8 points. Also suppose that the distribution of IQ's of Chapel Mountain University's students can be approximated by a normal model with mean 120 and standard deviation 10 points.
You select a student at random from each school. Determine the probability that the North Catalina State University student's IQ is at least 5 points higher than the Chapel Mountain University student's IQ.
A project manager at COMSOFT corporation has collected statistics on the organization's software development process. He has the size of each project in number of lines of code for the past 20 projects and the number of lines of code in error disc..
What are the differences between correlation and regression? What are the common pitfalls of using regression modeling?
Many advisers recommend using roughly 20% foreign stocks to diversify portfolios of U.S. stocks. You see that the 500 Index (U.S. stocks) and Diversi?ed International (foreign stocks) Funds had almost the same mean returns.
How do you go about calculating different probabilities--say an item was selected at random and we wanted to know how far it is from the mean or the probability that it is at least 4.5 or more?
1.During a recent year, speeding was reported in 12.9% of all automobile accidents in the United States (The World Almanac 2010).
For 95% confidence that the sample mean will not differ from the actual population mean by more than 0.1 ounces, what sample size is required?
Given that X‾ = 78, σ2 = 25, n = 10, and α = .05, test H0:µ > 80, assuming observations are randomly sampled from a normal distribution. Also, draw the standard normal distribution indicating where Z and the critical value are located.
Describe the five steps of hypothesis testing. Compare Type I and Type II errors and give specific examples for each. Which error should be minimized the most and first?
Census data below show that 8% of students in a certain country went to college or a trade school within a year of graduating from high school. A random sample of 715 high school graduates is selected. Use the normal approximation to the binomial ..
Find the margin of error for sample sizes of 5 to 100 by increments of 5-that is, let n = 5, 10, 15,..., 100. Plot the margins of error versus the sample sizes and summarize the relationship.
the abcd football association is considering a super ten football conference. the top 10 football teams in the country
Find the mean and standard deviation for each set of values:- 18, 19, 20, 21, 22 - 20, 20, 20, 20, 20 - 1, 5, 7, 8, 79.
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