A survey of mining companies is to be conducted to estimate p,
the proportion of companies...
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A survey of mining companies is to be conducted to estimate p,the proportion of companies that anticipate hiring engineers duringthe coming year. (a) How large a sample isrequired to estimate p to within 0.04 with 95% confidence?(b) A sample of 500 yields 105 companies that planto hire such engineers. Give the 95% confidence interval for p.
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Solutiona Given thatE 004 051 1 05 05At 95 confidence level the z is 1 95 1 095 005 2 005 2
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