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How large of a sample is required? How large of a sample would be necessary if no estimate were available for the proportion that support current policy?
Design a box model for your winnings (in dollars) on a single $1 bet on a pair of numbers in a game of Keno. Use as few balls as possible. Place the "values" in the table in ascending order (from sm
A sample of n = 16 scores has a mean of M = 65 and an estimated standard error of 2 points. What is the sample variance?
One school district, who adopted the use of the nonprofit's tutoring program and whose dropout rate has always been very close to the state average, reported in 2004 that 142 of their 1774 students
The other assumption of the binomial is that whether one student successfully completes the course does not affect whether any other student is successful.
A sales manager collected the following data on annual sales and years of experience. The estimated regression equation is Ybar=80+4x
A design is made up of five components in parallel. Only one of the components must function for the system to operate. The failure time of two of the components is exponentially distributed with pa
Suppose that the lengths are normally distributed. A quality specialist collects a random sample of 16 rods and finds the sample mean length to be 14.8 feet and a standard deviation of 0.65 feet. Wh
Which parts of the (ANOVA) null hypthesis are rejected by Newman-Keuls procedure? Use the closest number of degress of freedom.
We wish to test the null hypothesis that there is no linear relationship between the pretest score and the score on the final exam against the two-sided alternative.
Find a 95% confidence interval for the slope in each of the following settings: (note it is y caret)
A loss X this year has the pdf f(x) = 2(1+x)^-3, x>0, zero otherwise. Next year the loss will increase by 20%. Next year a deductible of 1 will be imposed. Calculate the expected payment next yea
In a market research study conducted by a local winery on white wine preference, the following results were found. Of a sample of 500 men, 120 preferred white wine and of a sample of 500 women, 210
What is the probability that less than 30% of the taxpayers from the sample used computer software to do their taxes? What is the probability that between 28% and 40% of the taxpayers from the sample
A cola-dispensing machine is set to dispense a mean of 2.020 liters into a container labeled 2 liters. Actual quantities dispensed vary and the amounts are normally distributed with a standard devia
The following table gives the average high temperatures in January and July for several European Cities. Write a 90% confidence interval for the mean temperature difference summer and winter in Euro
MTV Some students do homework with the TV on. (Anyone come to mind?) Some researchers want to see if people can work as effectively with as without distraction. The researchers will time some volunt
A random survey of autos parked in student and staff lots at a large university classified the brands by country of origin, as seen in the table. Are there difference in the national origins of cars
The sampling distribution for the sample mean is Normal with a mean of 14.8 feet and standard deviation of .65 feet. The mean of the sampling distribution for the sample mean is 14.8 feet
Weekly commodity prices for heating oil ( in cents) were obtained for a period of 30 weeks and regresses against time. Based on the regression output show below, what does the Durbin-Watson statisti
Let Y1, Y2, ... Yn denote a random sample from uniform distribution on the interval (0, theta).
What is the mean? (Note: The answer key says $4, but it doesn't make any sense to me) What is the probability that X is at least 4? (Note: The answer key says 2/3 but again, it doesn't make any sense)
Use the binomial distribution to calculate the probability of an event with p=.05 occuring 5 or more times out of 100. Use central limit thrm (with continuity correction).
Can you conclude at the 5% level that one way yields a different mean value than the other? Can you conclude at the 5% level that the variance of process 2 is lower than that of process 1?
Can you conclude from these results that the proportions of resistors in each of the categories are different for each company?