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A student must choose one of the subjects, art, geology, or psychology, as an elective. She is equally likely to choose art or psychology and twice as likely to choose geology. What are the respective probabilities that she chooses art, geology, and psychology?
Ed Norris has developed a Web site for his used textbook business at State University. To sell advertising he needs to forecast the number of site visits he expects in the future. For the last 6 months he has had the following number of site visit..
Is there evidence that the change was successful in reducing the wait time? (use 0.05 level of significance)
Prepare a 95% confidence interval for the average grocery bill. Would a 99% confidence interval be narrower or wider than the 95% confidence interval?
Briefly state the evaluation criteria for using a computed regression equation; specifically, comment on the coefficient of determination, correlation coefficient, and standard error of the estimate.
Market researchers would like to know if customers prefer a well-known brand over a generic brand of soft drink. They give a large sample of people the two drinks to taste in a random order and ask them which one tastes better.
Use the value 20 for the population standard deviation of scores on this subsection.
Consider a random variable Y, and a constant theta such that (1/theta)Y is distributed exponentially. Derive the lower and upper bounds for a 90% confidence interval for theta (These will be a function of y). Noe that theta=1/lambda where lambda i..
Bay Area University enrolls MBA students in three cohort programs: Weeknight, Saturday, and Distance. Dean Ed Epstein wants to know if there is a difference in the average of the students in the three programs.
A box of nine golf gloves contains two left-handed and seven right-handed ... box without replacement, what is the probability that- (X) both gloves are right handed and (Y) one left-handed and one ... If two gloves are randomly selected with repl..
Compute b1, slope of an OLS regression line using dollars spent as dependent variable (Y) and age as independent variable (X).
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
Assume that the result is a sample size beyond what you can obtain. Use the compromise function to compute alpha and beta for a sample approximately half the size.
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