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Past experience shows that the standard deviation of the yearly income of textile workers in a certain state is $400. How many textile workers would you need to sample if you wished to estimate the population mean to within $50.00, with probability .95?
In a survey of 750 senior business executives by Business Week magazine, 56% indicated that they felt that even if merit and abilities are equal, people with MBAs often get promoted faster than people without the degree. Prepare a 92% confidenc..
What is the probability that none of these crimes will be solved? What is the probability that at least one of these crimes will be solved?
Four cards are selected, one at a time, from a standard deck of 52 cards. Let x represent the number of aces drawn in a set of 4 cards.
the standard deviation of a distribution is 20. if a sample of 225 is selected what is the standard error of the
What is the calculation if facebook reports that the average number of facebook friends worldwide is 175.5 with a standard deviation of 90.57 . If i was to take a sample of 25 students, what is the probability that the mean number of facebook frie..
The data results are based on serum continine levels for each group. The claim is that exposure to tobacco smoke (as second-hand smoke) corresponds to higher levels of cotinine.
Estimate is too low for households in British Columbia. Can the value 0.64 be rejected if a survey of 490 homes in BC yields 331 with one or more lawn mowers?
You are going to invest $20,000 in a portfolio consisting of assets X, Y, Z as follows:
Identify any points that lie outside a 95% Confidence Level (Mean plus or minus two standard deviations) using the above winter mean and standard deviation. Explain your answer. Graph the data.
Apopulation consists of individuals whose weights are uniformly distributed between 100 and 175 pounds. What is the probability level for this distribution?
a random variable x takes values between 0 and 4 with a cumulative distribution functionfx x216 for 0 x 4a sketch
hypothesis tests are proposed. for each hypothesis test. a identify the variable bidentify the two populations
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