1, You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p = 0.69. You would like to be 95% confident that your esimate is within 5% of the true population proportion. How large of a sample size is required?

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2, You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 78%. You would like to be 99% confident that your estimate is within 5% of the true population proportion. How large of a sample size is required?

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3, You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately=60.3=60.3. You would like to be 99% confident that your estimate is within 2.5 of the true population mean. How large of a sample size is required?

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4, You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately=27.1=27.1dollars. You would like to be 98% confident that your estimate is within 1.5 dollar(s) of average spending on the birthday parties. How many parents do you have to sample?

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