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A certain segment of the sky contains Z starts. Each star is either a red giant with probability 1/3 or a white dwarf with probability 2/3, independently from the other stars.
(a) If we condition on the event {Z=4}, what is the joint p.m.f of the red giants X and the white dwarves Y? Fill in a 5*5 table with the
(f(x,y))from x,y=0 to 4 values
(b) Show that if Z~POI(6), then the random variables X and Y are indipendent and have Poisson distribution by calculating the joint p.m.f of X and Y
suppose certain coins have weights that are normally distributed with a mean of 5.319 g and a standard deviation of
the manager of the local national video store sells videocassette recorders at discount prices. if the store does not
Why is the F distribution important? How do you determine if a significant difference exists among the groups in ANOVA? How do you determine differences between the groups in ANOVA?
The average stock price for companies making up the S&P 500 is $40, and the standard deviation is $10. Assume the stock prices are normally distributed. What is the probability a company will have a stock price less than $33.
suppose a point xy is chosen at random from the disk x2 y2 lt 1. find a the marginal density of x and b the
in a certain class midterm score average out 60 with an sd of 15 as do scores on the final. the correlation between
A box contains ten fuses of which 3 are defective. Two fuses are selected at random from the box without replacement. What is the probability that exactly one of the fuses selected is defective?
1. a medical researcher contends that lung capacity varies significantly between smokers and nonsmokers. the mean
question 1 a sample of 2000 licensed drivers revealed the following number of speeding violations.number of
the joint probability mass function of x and y pxy is given byp1119p1219p130p2113p220p2316p3119p32118p3319compute exyi
Determine the probability that number of requests in 10 hour work day is between 68 and 80 inclusive? Give your answer to four decimal places.
Using the p-value approach, test the hypotheses at the 1% level of significance.
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