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According to Runzheimer International, a typical business traveler spends an average of $281 per day in Chicago. This cost includes hotel, meals, car rental, and incidentals. A survey of 60 randomly selected business travelers who have been to Chicago on business recently is taken. For the population mean of $281 per day, what is the probability of getting a sample average of more than $270 per day if the population standard deviation is $47?
Consider a random sample of size n from an exponential distribution, Xi ~ EXP(1,eta). a) Show that Q = X1:n - eta is a pivotal quantity and find its distribution.
experiments have shown that when a clean tungsten surface is heated by laser irradiation using a focused ruby laser the
ANOVA is a powerful statistical test. How does ANOVA differ from other parametric tests? What are the conditions that must be met to use a one-way ANOVA?
Think of your favorite casino game (craps, black-jack, roulette, etc) and analyze the probabilities of a few different outcomes.
the observed rate of drinking was the same in both cases although the sample size of the latter was twice as big. The critical region {X ¯>c} and p-value for the two cases are respectively?
Suppose you went to the Bureau of Labor Statistics web site and found several predictors of your salary. State three possible predictors and a simulated multilinear regression equation along with their p-values.
Assume the observed value of the test statistic is 1.53. What is the smallest level for which there is sufficient evidence to reject H 0 (i.e. the p-value for this test)?
Looking at sample distribution from part b, find out how big treatment effect is. Specifically, determine the distance between sample mean and original population mean?
How large a sample would be necessary to estimate the population proportion with a margin of error of 0.05 at 95% confidence?
you want to compare response rates percents of two regimens. a power of 90 and a two-sided test of size 0.05 are
calls to a customer service center last on average 2.4 minutes with a standard deviation of 1.5 minutes. an operator in
How much production capacity should the manufacturer reserve for the last day?
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