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Confidence interval for a population mean

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Question

  1. Find the 90% confidence interval for a population mean if the sample mean is 21.6 with a standard deviation of 2.8 for a sample of 35.
  2. Find the 95% confidence interval for a population mean if the sample mean is 146 with a standard deviation of 13 for a sample of 18.
  3. Find the minimum sample size to estimate population mean if the population standard deviation is 5.6. the confidence interval is 99% and the maximum error of estimate is 4.
  4. Find a 90% confidence interval for the population proportion if a sample of 106 had a sample proportion of 21%.
  5. FInd the minimum sample size to find a 95% interval estimate for a population proportion if previous sample had a sample proportion of 35% and you want to be accurate within 3% of the true proportion.

Reference no: EM132384268

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