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Find the minimum sample size your should use to assure that your estimate of p will be within the required margin of error around the population p. Margin of error: 0.09; confidence level: 95%; from a prior study, p is estimated by the decimal equivalent of 87%.
A researcher collects data on children's weights from a random sample of children in the South and concludes that children in the South weigh less than the national average.
A sample of 200 traffic accidents this year showed 74 persons were also involved in another accident within the last five years. Use the .01 significance level. Can we use z as the test statistic? Tell why or why not.
An occupational health study was carried out to evaluate the health status of workers. The response is forced expiratory volume (FEV), a measure of respiratory function
Suppose that X represents diameter measurements from a gamma distribution with a mean of 3 mm and a variance of 1.5 mm^2.
Compute the z score for the data company. Considering the altman model, comment on the likelihood that this firm will experience financial failures.
Suppose that you have a bag filled with 50 marbles, 15 of which are green. What is the probability of choosing exactly 3 green marbles if a total of 10 marbles are selected?
What is the probability that the mean annual precipitation during 49 randomly picked years will be less than 101.8 inches?
Does there seem to be any difference in the effect of the antibiotics on clearance of otitis media? Express your results in terms of relative risk (RR). Consider separate analyses for unilateral and bilateral cases. Also consider an analysis combi..
Prices (in dollars) were recorded for a sample of 60 randomly selected grocery items at each of the three supermarkets. In order to reduce item-to-item variation, the prices were recorded for each item on the same day at each supermarket. Identify..
Two colored dice are tossed. What is the probability that the sum of the numbers shown on the upper faces is equal to 7?
Determine the point estimate of difference between mean fuel efficiency rating for midsize cars and large cars? Calculate p-value for the hypothesis test.
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. What is the value of your test statistic.
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