Statistics

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Creating Classifier Data using Logistic Regression

Question The director of the MBA program at Salterdine University wants to develop a procedure to determine which applicants to admit to the MBA program. The director believes that an applicant’s undergraduate grade point average (GPA) and score on the GMAT exam are helpful in predicting whic ... Read More

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Probability of Success of Happy Harrys Hamburgers

Question Happy Harry's Hamburgers recently commissioned a top tier consulting company to develop a new location selection process. However, after receiving the first invoice from the consulting company, Happy Harry wasn't... happy that is, and he decided to cancel the remainder of the engagement. ... Read More

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Probability of Defective Lightbulbs in a Sample of 40

Question If the probability of a defective light bulb is 0.06, to be 98 % confident, up to how many defective lightbulbs should you expect in a sample of 40 lightbulbs? Summary This question belongs to statistics and discusses about probability of finding defective lightbulbs. Word count: NA &n ... Read More

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Vendor Stock for Hot Dog Concession at Safeco Field

Question A hot dog concession at Safeco Field sells an average of 33.2 hot dogs per hour (believed to follow a Poisson Distribution). How many hot dogs should the vendor stock in order to be 93% sure it has enough hot dogs for 2.5 hour(s)? F^-1(0.93)=   X=90   Summary This question ... Read More

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Meta Analysis of Survival Benefit of Radiotherapy

Question We will be conducting a meta-analysis to investigate whether surgery (cystectomy) combined with radiotherapy has a survival benefit (measured at 3-years) compared to radiotherapy alone for patients with bladder cancer. Conduct a keyword search in (ovid) Medline (untick “Map Term t ... Read More

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Meta Analysis of Chocolate Consumption and Cardiometabolic Disorders

Question Explain a “component cause” using the Rothman framework. In your answer you need to mention how sufficient and necessary causes relate to a component cause. Is this statement true or false? Lack of consistence does not necessarily constitute evidence against a causal associa ... Read More

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Lowering Defect Rate in Computer Chip Manufacturing Company

Question A company manufacturing computer chips finds that 8% of all chips manufactured are defective.  Management is concerned that high employee turnover is partially responsible for the high defect rate.  In an effort to decrease the percentage of defective chips, management decides to ... Read More

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Estimation of True Proportion with 98 Percent Confidence

Question A company manufacturing computer chips finds that 8% of all chips manufactured are defective.  Management is concerned that high employee turnover is partially responsible for the high defect rate.  In an effort to decrease the percentage of defective chips, management decides to ... Read More

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ABI Insurance Tracking Average Life Expectancy

Question Insurance companies track life expectancy information to assist in determining the cost of life insurance policies.  Last year the average life expectancy of all policy holders that were paid out was 77 years.  ABI Insurance wants to determine of their clients now have a longer l ... Read More

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Estimation of True Mean with 98 Percent Confidence

Question Insurance companies track life expectancy information to assist in determining the cost of life insurance policies.  Last year the average life expectancy of all policy holders that were paid out was 77 years.  ABI Insurance wants to determine of their clients now have a longer l ... Read More

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Statistics that a Professor Teaches are not Performing at the Same Level or Not

Question A professor is concerned that the two sections of statistics that she teaches are not performing at the same level. To test her claim, she looks at the mean exam score for a random sample of students from each of her classes. In class 1, the mean exam score for 12 students is 78.7 with a s ... Read More

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Testing Claim of SAT prep Course Claims to Increase Student Scores

Question An SAT prep course claims to increase student scores by more than 60 points, on average. To test this claim, 9 students who have previously taken the SAT are randomly chosen to take the prep course. Their SAT scores before and after completing the prep course are listed in the following ta ... Read More

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