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Workers in 2 different mine groups were asked what they considered to be the most important labour-management problem. In Group A, 200 out of a random sample of 400 workers felt that a fair adjustment of grievances was the most important problem. in Group B, 60 out of a random sample of 100 workers felt that this was the most important problem. Would you conclude that these 2 groups differed with respect to the prpportion of workers who believed that fair adjustment of grievances was the most important problem? Test at a=0.1
A study regarding the relationship between age and the amount of pressure sales personnel feel in relation to their jobs revealed the following sample information.
Of the 38 numbers on a roulette wheel, 18 are red, 18 are black and 2 are green. If the wheel is balanced, the probability of the wheel landing on red is 0.474.
For how many of the 100 days was the number of paying customers within three standard deviations of the mean? Explain how you determined your answer.
Suppose that p = P(female birth) = 0.5. A couple wishes to have exactly one female child in their family. They will have children until they have a girl, then they will stop having children. What is the probability that the family has three childre..
Prediction equation is y^ = 30 + 0:60x. Determine predicted final exam score for student who has (i) midterm score = 100, (ii) midterm score = 50. Note that predicted nal exam score regresses toward mean.
Machine which fills quart milk cartons is set up to average 32.2 oz per carton, with standard deviation of 1.2 oz. Determine probability that filled carton will contain less than 32 oz of milk?
At the .05 significance level, is the number of units produced on the afternoon shift larger?
Using the .05 level, what should the experimenter conclude? (a) Use the steps of hypothesis testing, (b) sketch the distributions involved.
In a recent survey, 80% of the citizenry in a community favored the building of a municipal golf course. If you ask 15 citizens about this project, find the probability that
In business, investors are always interested in the tradeoff between returns and risk. Regression analysis is a statistical technique that can be used to quantify this risk.
If a male passenger is randomly selected, find the probability that he can fit through the doorway withouth bending.
A standard deviation of 0.6 miles per gallon, find the probability that a car has a gas mileage of between 28.8 and 29.2 miles per gallon.
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