Solution Library
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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Sufficient Evidence to Say that Batting Average has Improved
Question Adrian hopes that his new training methods have improved his batting average. Before starting his new regimen, he was batting 0.220 in a random sample of 50 at bats. For a random sample of 24 at bats since changing his training techniques, his batting average is 0.375. Determin ... Read More
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Project Report on Life Expectancy at Birth in World in 2012
Question Prepare a project report on Life expectancy at birth, total (years) in world in 2012 Objectives Identify a hypothesis testing problem in Conduct a survey to verify or dispute the results of the hypothesis Summarize the article, analysis, and conclusions in a report Summary ... Read More
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Regression Analysis of Digital Cell Phone Inc
Question Digital Cell Phone, Inc. Paul Jordan has just been hired as a management analyst at Digital Cell Phone, Inc. Digital Cell manufactures a broad line of phones for the consumer market. Paul’s boss, John Smithers, chief operations officer, has asked Paul to stop by his office this morn ... Read More
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Research on Gender Confusion among Urban Adolescents
Question Write a research paper on the topic "Gender confusion is more prevalent among urban adolescents." Summary This question belongs to statistics and discusses gender confusion among urban adolescents. Word count: 2480 ... Read More
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Running Appropriate Descriptive Statistics on Given Variables
Question Run the APPROPRIATE descriptive statistics on the variables Earn5yr, Test2005, Grad2005, SkillVal, STEM2010, FacSal05, FamIncL and FirstGen, and report them in a table. Summary This question belongs to statistics and discusses about appropriate descriptive statistics on variables. Word ... Read More
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Comparison of ACT and SAT Math Scores of First Generation Students
Question Compare the average ACT/SAT math scores (for students entering in 2005-2006) across the three groups of schools categorized by the proportion of first-generation students. Which differences are significant at the 5% level? Does taking in more first-generation students lower the average tes ... Read More
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Relation Between Family Income and Proportion of First-Generation Students
Question Is there a statistically significant relation between the average family income of students and the proportion of first-generation students (i.e. those whose parents did not go to college) attending a school? Describe the relation in your own words, and suggest an explanation. Summary Th ... Read More
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