1. 1)AccordingtoastudyconductedbyDellComputers,65%ofmenand70%ofwomensaythatweightisaveryimportantfactorinpurchasingalaptopcomputer.Supposethissurveywasconductedusing374menand481women.Dothesedatashowenoughevidencetosupporttheconclusionthatthereisnodifferenceintheproportionofmenandwomenwhothinkweightisafactorinpurchasingalaptop?Usea5%levelofsignificance.
3. 2)In a study of annual salaries of employees, random samples were selected from two companies to see if there is a difference in their average annual salaries. For Company "A" the sample size was 72, the sample mean was $48,000 and the sample standard deviation was $12,000. For Company "B" the sample size was 50, the sample mean was $43,000 and the sample standard deviation was $10,000. Test for a significant difference in salaries at a 5% level of significance. What is your conclusion?