Q1. Determine the minimum sample size required when you want to be 95% confident that the sample mean is within two units of the population mean. Assume a population standard deviation of 4.3 in a normally distributed population.
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5VB. Calculating minimum sample size (Links to an external site.) (1:52)
5DG. Why set a minimum sample size (DOCX)
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correct answer is 18
Q.2 Under a time crunch, you only have time to take a sample of 15 water bottles and measure their contents. The sample had a mean of 20.05 ounces with a sample standard deviation of 0.4 ounces. What would be the 90% confidence interval, when we assumed these measurements are normally distributed?
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5VE. Confidence intervals with sample standard deviationLinks to an external site. (1:37)
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