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12. Let X, X1, X2, X3,... be random variables that are positive and integer valued. Show that Xn """ X if and only if for every integer k.
lim n→∞ P(Xn = k) = P(X = k)
13. Let Z1, Z2,... be iid random variables with density f . Suppose that P(Zi > 0) = 1 and that λ = limx↓0 f (x) > 0. Let Xn = n min{Z1,..., Zn}.Show that Xn """ Z where Z has an exponential distribution with mean 1/λ.
What is the point estimate for the difference between the means of the two populations?
Define statistics. Identify different types and levels of statistics.
How much should they charge for a 2 year extended warranty so that they will still make money selling the extended warranties in the long run and keep the cost of the warranties as low as possible to make them more marketable?
In the context of hypothesis testing regarding one mean, the test (Z or t) may be statistically significant at the 5% level, but not significant in a practical sense at all. Illustrate the meaning of this statement by citing 3 examples from any ar..
a presidental candidate conducts a poll of likely voters in ohio to determine their mean age answer the following1.
In a mobile phone shop on a Sunday morning, out of n = 77 customers x = 19 buy a mobile phone. What is the 95% confidence interval for the proportion of customers buying a mobile phone?
After a second two-week period, the LDL cholesterol level of each person was recorded again. The data are shown in Table E2.18. Calculate the LDL difference (cornflake-oat bran) for each of the 14 men, then the mean x, variance s2, and standard de..
In-Home stability ratings of children and teenagers age 4 to 14 years who have been diagnosed with ADHD and who are being treated with neurotherapy differs from in-home stability ratings of children and teenagers age 4 to 14 years who have been di..
In light of these data, are the percentages of divorcing couples with prenuptial agreements equal in these four places?
Machine X test unit cost $3000 with beta=3 and theta=500, Machine Y test unit cost $2000 with beta=3 and theta=400. If the machines oil fixtures has life of 20 hrs, which machine goes to market first?
The following table shows the number of defective, acceptable, and superior items in samples taken both before and after the introduction of a modification in the manufacturing process.
Based on the results of the peliminary poll, how large a sample is required for the main poll, assuming that the main poll should have a margin of error of 3.3% and a confidence level of 96.7%.
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