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How do I calculate the formula for confidence intervals for proportions?
Hi I am having particular difficulty with this question. A financial analyst wants to determine the mean annual return on mutual funds. A random sample of 60 returns shows a mean of 12%, Assume that the population is normally distributed and the population standard deviation is 4%. The...
a random sample of 20 pages of an textbook was made and 60% had drawings or figures on the. Find the 95% confidence interval for the actual proportion of pages on which a drawing or figure would be found?
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the weight, in pounds, of samples (n=6) of the contents of cans of regular and diet soda are listed below. Does there appear to be a signifacant difference between the two data sets? How might that difference be explained? Calculate the 90% confidence interval for mean weight for each type of can? ...
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