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A recent study was designed to compare smoking habits of young women with those of young men. A random sample of 150 women revealed that 45 of them smoked. A random sample of 100 men indicated that 25 smoked. At the significance level does the evidence show that a higher proportion of women smoke?
A Variable has a mean of 100 and a standard deviation of 16. Four observations of this variable have a mean of 108 and a sample standard deviation of 12. Test whether the sample has been drawn from the population.
A random check of 81 records of inmates from all federal prisons found the confidence interval for mean prison terms per prisoner to be 2.113 years to 2.287 years.
A coin is unbalanced such that it comes up tails 55% of the time. In an effort to prove that the coin is unfair, an experimenter flips the coin 50 times.
Suppose that the incidence of MI is 0.005 per year among subjects who are actually take placebo and that aspirin prevents 20% of MIs
To test the effectiveness of a new studying strategy, a teacher randomly divides a sample of 8 students into tow groups, with n = 4 in each group.
Is there evidence that the population mean amount is different from 8.17 ounces? (Use a 0.05 level of significance and determine the p-value and interpret its meaning.
Use this information to construct a probability table, and then calculate each of the following probabilities: P(foreign car)
Compute the probability that randomly chosen student with a Master's degree majored in English or mathematics?
Calculate expected number of interruptions per day. Calculate standard deviation.
Create Gantt chart using MSP. Suppose the 5 day workweek, compute critical path of the project.
Multiple choices based on regression analysis - the percentage of variation in the dependent variable explained by the variation in the independent variable
Consider the following data on 20 chemical reactions, with Y = chromatographic retention time (seconds) and X = molecular weight (gm/mole).
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