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A random sample of 53 students were asked for the number of semester hours they are taking this semester. The sample standard deviation was found to be 4.7 semester hours. How many more students should be included in the sample to be 99% sure the sample mean is with 1 semester hour of the population mean for all students at this college? There should be more included in the sample to meet the requirement.
Problem based on decision tree - Evaluate the strategy that maximizes the manufacturer's expected net earnings.
Five test vehicles of each kind were crashed, with results given below. Research question: Are mean crash damages the same for these 3 vehicles?
Findout the percentage of trainees earns less than $900 a month utilizing normal distribution.What percentage of trainees earns less than $900 a month?
Assume that 5% of men and only .25% of women are colorblind. A colorblind person is chosen at random:
The U.S. Food and Drug Administration (FDA) performed a study that compared the carbohydrate content (as a percentage of weight) of several major brands of corn and potato chips.
If they didn't launch new mixing plant another alternate can contribute twenty five million profit for the same period (i.e. estimated 6 years). Draw the complete decision tree and determine whether the product should be launched or not.
Suppose prior elections in Louisiana indicated it is necessary for a candidate for governor to receive at least 80 percent of the vote in the northern part of the state to be elected.
The F test is used in Analysis of Variance (ANOVA). When would a researcher use an ANOVA? Explain (one paragraph in length).
Describe the target population, sampling frame, sampling unit, and observation unit. Discuss any possible sources of selection bias or inaccuracy of responses.
A sample of 10 persons is used to measure the effectiveness of two massage techniques. The effectiveness of the techniques is measured by the number of days that pass by before the subjects feel the need for another massage session.
Microfracture knee surgery has a 75% chance of success on patients with degenerative knees. The surgery is performed on 5 patients. Find the probability of the surgery being successful on less than 3.
Parents collected a simple random sample of the times that 81 college students required to earn their bachelor's degrees. The sample has a mean of 4.8 years and a standard deviation of 2.2 years. Use a 0.05 significance level to test the claim tha..
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