Question

# To estimate the true proportion of students who abstain from alcohol at LBCC, you will need to take a simple

random sample. a) How large a sample would you need if you want your estimate to be within .03 of the true value with a 97% confidence level and you know nothing about the population? b) Repeat part (a) except now you know that a previous study found that 19% of college students abstain from alcohol. c) For a sample size 96, you came up with a confidence interval of (.159, .241). What is the confidence level of this interval? d) Using the information in part (c), create a 99% confidence interval.

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