(4) In a randomly selected sample of 100 students at a University, 85% had use of a laptop computer.Calculate a 99% confidence interval for the proportion of all students who had use of a laptop computer.(5) To conduct a research project on college student income, the number of students to sampleneeds to be calculated. To estimate the mean population income, we decide to use a 99% levelof confidence. The desired margin of error is plus or minus $200. The standard deviation fromother studies of student income is $1500. What sample size should be used?(6) An investigator wants to estimate the prevalence of breast cancer among women who arebetween 40 and 45 years of age living in Boston. How many women must be involved in thestudy to ensure that the estimate is precise? National data suggest that 1 in 235 women arediagnosed with breast cancer by age 40. This translates to a proportion of 0.0043 (0.43%) or aprevalence of 43 per 10,000 women. Suppose the investigator wants the estimate to be within10 per 10,000 women with 95% confidence(7) An investigator wants to estimate the proportion of freshmen at his University who currentlysmoke cigarettes (i.e., the prevalence of smoking). How many freshmen should be involved inthe study to ensure that a 95% confidence interval estimate of the proportion of freshmen whosmoke is within 5% of the true proportion?(8) To conduct a research project on whether college students purchase textbooks, the number ofstudents to sample needs to be calculated. To estimate the population proportion, we decide touse a 95% level of confidence. The desired margin of error is plus or minus 0.10. There is noonulation pronortion What sample size should be used?

Name: (4) In a randomly selected sample of 100 students at a University, 85
Uploaded: 2024-03-05T11:52:21.000Z
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Description: (4) In a randomly selected sample of 100 students at a University, 85% had use of a laptop computer.Calculate a 99% confidence interval for the proportion of all students who had use of a laptop computer.(5) To conduct a research project on college

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In a randomly selected sample of 100 students at a university, 85% had use of…

din men 43%