"quantity"exercise:Sampling and Estimation
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Questions 1:
The following information applies to a portfolio composed of Fund A and Fund B:
The portfolio's standard deviation of return is closest to:
A、 7.38%.
B、 8.80%.
C、 8.35%
Questions 2:
A mutual fund manager wants to create a fund based on a high-grade corporate bond index. She first distinguishes between utility bonds and industrial bonds; she then, for each segment, defines maturity intervals of less than 5 years, 5 to 10 years, and greater than 10 years. For each segment and maturity level, she classifies the bonds as callable or noncallable. She then randomly selects bonds from each of the subpopulations she has created. For the manager’s sample, which of the following best describes the sampling approach?
A 、Simple random
B、 Systematic
C 、Stratified random
C is correct. In stratified random sampling, one divides the population into subpopulations and randomly samples from within the subpopulations.
A is incorrect. The approach described is called stratified random sampling. In stratified random sampling, one divides the population into subpopulations and randomly samples from within the subpopulations.
B is incorrect. The approach described is called stratified random sampling. In stratified random sampling, one divides the population into subpopulations and randomly samples from within the subpopulations.
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