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Question: Suppose that 30% of all drivers stop at an intersection having flashing red lights when no other cars are visible. Of 15 randomly selected drivers coming to an intersection under these conditions, let X denote the number of those who stop.
(a) The random variable X is (choose one)
(i) binomial
(ii) hypergeometric
(iii) negative binomial
(iv) Poisson.
(b) Give the expected value and variance of X.
(c) Find the probabilities P(X = 6) and P(X ≥ 6). You may use R commands.
How might physical activity play a role as a third variable? Discuss its possible relation to both bone density and cola consumption.
Provide a 350- to 700-word summary of your results, including graphical representations of your findings. Plot the information on your graph.
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the following is the results of a regression analysis of vehicle fuel efficiency mpg and vehicle weight in thousands of
Quality control engineer has been checking output by almost continuous sampling as abnormal condition began. Determine the probability that in sample of 10 pieces.
A researcher wishes to construct a 95% confidence interval for a population mean. She selects a simple random sample of size n=20 from the population.
1. in a statistical test of hypotheses we reject the null hypothesis at alpha ifa the p-value is smaller than alpha.b
let x red blood cell rbc count in millions per cubic millimeter of whole blood. suppose that for healthy females x has
An accounting firm has recently recruited six graduates: three men and three women. Three of the graduates are to be selected at random to work in the firms suburban office. Construct a probability tree.
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An article in the National Geographic News (February 24, 2005) reports that Americans are increasingly skimping on their sleep. Specify the null and alternative hypotheses
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