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A Christmas tree light has an expected life of 200 hr and a standard deviation of 2 hr.
(a) Find a bound on the probability that one of these Christmas tree lights will require replacement between 190 hr and 210 hr.
at least
%
(b) Suppose a large city uses 120,000 of these Christmas tree lights as part of its Christmas decorations. Estimate the number of lights that are likely to require replacement between 180 hr and 220 hr of use.
lights
Define "Type I error" in your own words. When should we use the t distribution? How do we find the degrees of freedom when using the t-distribution to estimate or test the mean of a sample from a single population..
If after one year, the annual mileage of privately owned cars is normally distributed with mean 14,000 miles and standard deviation 3,500, what is the probability that a car has mileage greater than 20,000 miles?
A department head wants to investigate the quality of teaching of a professor who is coming up for tenure.
Estimate p from repeated pairs of y1 and Y2 and (b) use the sums and difference of the responses.
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Events A, B, and C are defined in an outcome space, Find expressions for the following probabilities in terms of P(A), P(B), P(C), P(AB), P(AC), P(BC).
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(a) Determine the loop transfer function Gc(s)G(s). (b) Plot the log-magnitude-phase (similar to Figure 8.27), and identify the frequency points for ω equal to 1, 10, 50, 110, and 500. (c) Is the open-loop system stable? Is the closed-loop system ..
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