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Problem 1: Prove that there are no integers x, y, and z such that
x^2 +y^2 + z^2 = 999
Problem 2: Show that square root of 2 cubed is an irrational number.
Problem 3: For each of the following pairs a and b, use the division algorithm to find quotient q and remainder r.
(a) b=189, a=17
(b) b=111, a= -5
(c) b= -1029, a=27
(d) b= -111, a= -4
The mean is a useful measure, but it can be misleading. Describe a circumstance when the mean is very useful as the average and a circumstance when the mean is very misleading as the average.
a) Under what circumstances can z be greater than one? b) Under what circumstances can a probability be greater than one?
A study was conducted to determine whether there were significant differences between medical students admitted through special programs (such as affirmative action) and medical students admitted through regular criteria.
Two mating parts have critical dimensions x1 and x2 as shown below. Assume that x1 and x2 are normally distributed with means 1 and mean2 and standard deviations s1 = 0.400 and s2 = 0.300.
Assume that a 95% confidence interval for the mean is 15.0
What is the probability that a student who has failed the test came from the South District?
In 2010, 65% of adult Americans thought that the death penalty was morally acceptable. In a poll conducted by the Gallup Organization, a simple random sample of 1005 adult Americans
Assume that results of survey were used to create seperate 99% confidence intervals for boys and girls. would the margins of error be same as, larger , or smaller than that for question one?
A researcher used stepwise regression to create regression models to predict Birthrate (births per 1000) using five predictors:
A sample of 64 observations is selected from a normal polulation with a population standard deviation of 15. The sample mean is 215. Ho: U>= 220 and H1: U
Find the expected frequency for the number of days in which there was exactly one application. Determine the expected frequency for the other days in a similar manner.
Customers enter the waiting line at a cafeteria on a first-come, first-served basis. The arrival rate follows a Poisson distribution, while service times follow an exponential distribution.
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