Question

A recent report suggests that Chief Information Officers​ (CIO's) who report directly to Chief Financial Officers​ (CFO's) rather than Chief Executive Officers​ (CEO's) are more likely to have IT agendas that deal with cost cutting and compliance. In a random sample of 757 ​companies, it was found that​ CIO's reported directly to​ CFO's in 166 out of 489 service firms and in 92 out of 268 manufacturing companies.

Give a 90​% confidence interval for the difference p1-2​, where p1 and p2 are the proportions of​ CIO's who report directly to the CFO in service firms and manufacturing​ companies, respectively.  

The 90​% confidence interval is (___, ___)

Answer 1