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Suppose a population consists of n pairs of people, meaning there 2n people in the population. Suppose k of the people die. What is the expected number of remaining couples?
What is the probability that there are at least 40 "Bright" people among 1000 randomly chosen people? I) What is the probability that there are no more than 5% of "Bright" people among 1500 randomly chosen people?
If many samples of size 1000 persons are chosen, determine the expected value (mean X-bar) or average of average IQ's for these samples?
Find the mean, median, mode, sample variance, and range. Do you think that this sample might have come from a normal population? Why or why not?
components used in a cellular telephone are manufactured with nominal dimension of 0.3 mm and lower and upper
You have been asked to analyse Grand Plomp Ltd, a maker of rocket widgets used by NASA. The owners are wondering whether the return received is sufficient to justify the risks taken in each division.
Construct a time series plot. What type of pattern exists in the data? Compute the exponential smoothing forecasts for a = .2.
find the moment generating function for y2 where y is an independent standard normal random
In a goodness-of-fit test where the sample size is 200, there are 5 categories, and the significant level in .05. The critical value of X2 is.
To test the difference between two means using two mean z test.
assume that the number of customers who arrive at a water ice stand follows the poisson distribution with an average
You are concerned about wait times at the cash registers in the supermarket. You collect data and have a sample size of 10, which test would you use a Z or a T test and why?
For a binomial probability experiment, if p is 0.1 and n is only 150, we cannot use the normal approximation to the binomial distribution without continuity correction.
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