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Let X1,..., Xn be a random sample from a population with the mean μ. What condition must be imposed on the constants c1, c2,..., cn so that c1X1 + c2X2 + ··· + cnXn is an unbiased estimator of μ?
A machine cuts circular filters from large rolls of material. If 7.3% of the filters fail to meet specifications, use the normal approximation to the binomial to compute the probability that a sample of 100 of the filters will contain 5 or fewer that..
the distribution of grades on a certain test has a mean of 85.5 with a standard deviation of 11.2. there are 400 tests.
consider the following.a the empirical rule indicates that we can expect to find approximately what percentage of the
In the end, of course, conclusions are drawn about how an entire population would respond based on the responses from randomly selected group of people.
a publisher wants to estimate the mean length of time in minutes all adults spend reading newspapers. to determine this
a grocery store needs to sell 3000 cartons of 2l 2 milk per month. the sales is relatively constant throughout the
Assume that the process is in control and that the population of all jar fills is normally distributed. (Round the z-values to 2 decimal places and final answer to 4 decimal places. Negative amounts should be indicated by a minus sign.)
the probability that a new advertising campaign will increase sales is assessed as being 0.80. the probability that the
With each hypothesis, indicate whether the appropriate analysis would be a one-tailed test or a two-tailed test and indicate a type I and type II error, given the context of the hypothesis.
What is the average time that a customer spends waiting to be called to a chair?
a shipment of 7 television sets contains 2 defective sets. a hotel makes a random purchase of 3 of the sets. if x is
1. if the correltation coefficient has associated probability value of .02 thenthe result is importantthe hypothesis
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