Suppose that a researcher wants to estimate the percentage of all students whose CGPA is above 3.25. (a) If it can be presumed that the sample proportion (from a preliminary sample) is 0.73 and the maximum error that can be taken is 0.026, at 96.5% confidence level could you estimate the approximate sample size? (b) What is the approximate sample size for (a), if preliminary sample is not being considered?

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11. Šuppose that a researcher wants to estimate the percentage of all
students whose CGPA is above 3.25.
(a) If it can be presumed that the sample proportion (from a
preliminary sample) is 0.73 and the maximum error that can be
taken is 0.026, at 96.5% confidence level could you estimate the
approximate sample size?
(b) What is the approximate sample size for (a), if preliminary
sample is not being considered?
Transcribed Image Text:11. Šuppose that a researcher wants to estimate the percentage of all students whose CGPA is above 3.25. (a) If it can be presumed that the sample proportion (from a preliminary sample) is 0.73 and the maximum error that can be taken is 0.026, at 96.5% confidence level could you estimate the approximate sample size? (b) What is the approximate sample size for (a), if preliminary sample is not being considered?
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