Determining evaluation and the margin of error

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Q1) In past, percent of smokers able to give up smoking "cold turkey" was reported to be no more than 0.10. If we wanted to make new estimate of that percent that now were able to give up "cold turkey" with precision (margin of error ) of plus and minus 0.02 and with 99% confidence, how large sample would be required? What sample size would be needed to make that evaluated within plus and minus 0.03 and with 95% confidence?

Q2) Job training program trained thousands of participants. After training was completed, random sample of 64 of these participants illustrated that only eight had retained jobs in which they were placed for more than three months. If we wanted to evaluate the percentage of trainees retaining jobs for more than three months (suppose that 64 comprised random sample of all trainees) with 95% confidence, what would that evaluation be and what is the margin of error?

Reference no: EM1313928

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