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Let X1, X2, X3 be a random sample of size n=3 from the Poisson distributions with respective means l1 = 4, l2= 5, l3= 5.
a) Find P(X1 + X2 + X3 = 1)
b) Find the mean and variance of Y = X1 + X2 + X3
question global tv news in a segment on the price of gasoline reported that the mean price nationwide is 1.29 per
15% with salmonella, and 13% with both. What is the probability that a tested chicken was not contaminated with either kind of bacteria?
Explain how one extreme score influences mean and standard deviation.
a pair of dice is rolled 5 times. find the probability that a total of 11 occurs twice before a total of 5
At the 0.10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
What is the value of the test statistic? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
Random sample of 40 November days (taken over many years)? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.
Wwhat are our h0 and ha ? (c) compute zobt.(d) with a= .05, what is zcrit? (E) do we have evidence of a relationship in the population? if so describe the relationship.
You attempt a 50 item (n = 50) true-and-false exam. You did not study for the material and your attempt to answer any item is a guess, with a 50% chance that you will get any item correct. You need a score of 30 or better to pass the exam.
A particular candidate claims she has the support of at least 60% of the voters in her district. A random sample of 150 voters yields 87 who support her. The candidate wishes to test her claim at the 0.05 level of significance.
Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution.
What is the 99% confidence interval?
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