Which of the following is / are true?
Answer(s): F
The sample mean is used to estimate the population mean, not the other way around. The sum of all the available observations divided by the number of observations is the sample mean, not the population mean (unless the observation set equals the entire population, which is almost never the case).
The R-square in a univariate regression measures:
Answer(s): C
It should be noted that in a univariate regression, the square root of R-square equals the correlation coefficient.The significance of a univariate or a multivariate regression is measured by the F-statistic.
John buys a house that costs $175,000 and agrees to pay for it with a 15 year mortgage at 7% per year, compounded monthly. What is John's monthly payment on the loan?
Answer(s): E
On the BAII Plus, press 180 N, 7 divide 12 = I/Y, 175000 PV, 0 FV, CPT PMT. On the HP12C, press 180 n, 7 ENTER 12 divide i, 175000 PV, 0 FV, PMT. Make sure the BAII Plus has the P/Y value set to 1.
Each salesperson in a large department store chain is rated either below average, average, or above average with respect to sales ability. Each salesperson is also rated with respect to his or her potential for advancement either fair, good, or excellent. These traits are the 500 salespeople were cross classified into the following table.Sales Ability Potential for AdvancementFair Good ExcellentBelow Average 161222Average 456045Above Average 9372135What is the probability that a salesperson selected at random will have average sales ability and good potential for advancement?
Prob. of selecting a person with average sales ability: (45 + 60 + 45)/500 = 3/10. Prob. of selecting good potential amongst those with average sales ability: 60/150. Therefore: 3/10*6/15 = 0.12.
You are given a risk-free rate of 3% per year, a portfolio return of 8% per year, and a standard deviation of portfolio return of 22% per year. What is the Sharpe measure of risk-adjusted performance?
The Sharpe measure of risk-adjusted performance is equal to (rbar_p - rbar_f)/sigma_p, where rbar_p is the mean portfolio return, rbar_f is the mean risk-free return, and sigma_p is the standard deviation of portfolio return. In our case, we have (8% - 3%) / 22% = 5/22 = 0.227.
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