Companies are spending more time screening applicants than in the past. A study of 102 recruitors conducted by ExecuNet found that 77 did Internet research on candidates (data extracted from P. Kitchen, “Don’t Let Any ‘Digital Dirt’ Bury Your Job Prospects.” Newsday, August 21, 2005, p. A59).
a. Construct a 95% confidence interval estimate of the population proportion of recruiters who do Internet research on candidates.
b. Based on (a), is it correct to conclude that more than 70% of recruiters do Internet research on candidates?
c. Suppose that the study uses a sample size of 400 recruiters and 302 did Internet research on candidates. Construct a 95% confidence interval estimate of the population proportion of recruiters who do Internet research on candidates.
d. Based on (c), is it correct to conclude that more than 70% of recruiters do Internet research on candidates?
e. Discuss the effect of sample size on your answers to (a) through (d).
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