You are a data mining consultant hired by your organization to implement a data mining process. What challenges does your organization face in ensuring that the data mining models are receiving clean data?

Consider a treasury bill with a rate of return of 5% and the following risky securities: security a: e(r) = .15; variance = .0400 security b: e(r) = .10; variance = .0225 security c: e(r) = .12; variance = .1000 security d: e(r) = .13; variance = .0625 the investor must develop a complete portfolio by combining the risk-free asset with one of the securities mentioned above. the security the investor should choose as part of her complete portfolio to achieve the best cal would be a. security a b. security b c. security c d. security d

After the embarrassing sign incident at the restaurant you own, you decide to offer employees a six-week fundamental writing skills workshop. a local business communication instructor, who has experience teaching writing skills at treleaven community college, will facilitate the sessions. to encourage employees to attend these optional sessions, write an email that explains why you’re offering the workshop and why employees should participate.

You are to receive five gold coins from your great uncle as an incentive to study hard. the coins were originally purchased in 1982. your great uncle will deliver the coins the week after finals (assuming your grades are "acceptable"). the amount your great uncle paid for the coins is a(n): indirect cost.overhead cost.opportunity cost.sunk cost.