In 2005, the Statistical Society of Canada (SSC) had 864 members listed in the online directory. An SRS of 150 of the members was selected; the sex and employment category (industry, academic, government) was ascertained for each person in the SRS, with results in file ssc.dat.

a What are the possible causes of selection bias in this sample?

b Estimate the percentage of members who are female, and give a 95% CI for your estimate.

c Assuming that all members are listed in the online directory, estimate the total number of SSC members who are female, along with a 95% CI.

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