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1. How can the manager of a ?rm producing lightbulbs summarize and describe to a board meeting the results of testing the life of a sample of 100 lightbulbs produced by the ?rm? 2. (a) Why may the manager in Prob. 1 want to engage in statistical inference?
(b) What would this involve and require?
Prove that there are no integers x, y, and z such that. Show that square root of 2 cubed is an irrational number.
let x be a discrete random variable with possible values x ?1012 and probability function fx kx3 0.15 for x ?1012.a
the average time it takes college freshmen to complete the mason basic reasoning test is 38.3 minutes. the standard
A quality control engineer wanted to estimate the mean weight (in grams) of M&M candies being produced on a certain machine in the factory. After collecting an appropriate random sample of M&M candies, he obtained the following weights:
for a random sample of 50 measurements on the breaking strength of cotton threads the mean breaking strength was found
devices are made up of five independent components. a given device operates if at least four of its five components are
a man pays 400 for a 1 year life insurance with coverage of 200000.given his age he has a .995 chance of living for at
1. when an engineer wants to send a binary signal a 0 or 1 signal through a communication channel assume that there is
a journal article reports that a sample of size 5 was used as a basis for calculating a 95 ci for the true average
question 1 a neighbourhood medical centre initiates a study to evaluate the wait time. the records of 18 randomly
Recognize and describe potential threats (up to 3) to internal validity.
Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points.
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