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A study has been made to compare the nicotine contents of two brands of cigarettes. fifty cigarretes of brand A had an average nicotine content of 3.1 milligrams with a standard deviation s=0.7 milligram, while sixty cigarettes of brand B had an average nicotine content of 2.7 milligrams with standard devation s=1.0 milligram. construct a 95% confidence interval for the difference between the mean nicotine content of two brands of cigarettes.
A study conducted at a certain college shows that 53% of the school's graduates find a job in their chosen field within a year of graduation. Find the probability that among 7 randomly selected graduates, at least one finds a job in his or her cho..
Cores on two tests have a bivariate normal distribution; and that correlation of 2 scores is 0.8. Determine the probability that sum of the student's scores on 2 tests will be greater than 200?
Project was estimated by using ADM/PERT analysis. Due to extensive length of project many activities were combined; Following is the result.
Determine the Midrange. Determine the Standard Variance. Determine the Standard Deviation
Determine the rejection region for the test of Ho: (mean 1 - mean 2) > 2.43 Use a = 0.04. z >
How much does the low temperature vary on this date? In other words calculate the variance and standard deviation?
Standard deviation of 100. The top 3% of students receieve $500. What is the minimum score you would need to receive this money? Calculate the z-score.
A teacher claims that the variance on a calculus test is 68. A sample of 28 students had a standard deviation of 5.8. Test the teacher's claim at the 0.05 level of significance.
Irrelevant costs associated with the decision to sign an act (make/own) as opposed to just distributing one (buy/lease)? Identify at least 2 relevant and 2 irrelevant costs.
When sampling is done for the proportion of defective items in a large shipment, where the population proportion is 0.18 and the sample size is 200, what is the probability that the sample proportion will be at least 0.20?
What is the probability that 25% or fewer male employees will indicate that they have to pick up the slack for moms working flextime?
Clark Heter is an industrial engineer at Lyons Products. He would like to conclude whether there are more units produced on the afternoon shift than on the day shift. A sample of 54 day-shift workers showed that the mean number of units produced w..
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