标题: Reading 7: Statistical Concepts and Market Returns-LOS b习题 [打印本页]
作者: bmaggie 时间: 2010-4-9 13:28 标题: [2010]Session 2:-Reading 7: Statistical Concepts and Market Returns-LOS b习题
Session 2: Quantitative Methods: Basic Concepts
Reading 7: Statistical Concepts and Market Returns
LOS b: Explain a parameter, a sample statistic, and a frequency distribution.
Twenty students take an exam. The percentages of questions they answer correctly are ranked from lowest to highest as follows:
|
32 |
49 |
57 |
58 |
61 |
|
62 |
64 |
66 |
67 |
67 |
|
68 |
69 |
71 |
72 |
72 |
|
74 |
76 |
80 |
82 |
83 |
In a frequency distribution from 30% to 90% that is divided into six equal-sized intervals, the absolute frequency of the sixth interval is:
作者: bmaggie 时间: 2010-4-9 13:28
Twenty students take an exam. The percentages of questions they answer correctly are ranked from lowest to highest as follows:
|
32 |
49 |
57 |
58 |
61 |
|
62 |
64 |
66 |
67 |
67 |
|
68 |
69 |
71 |
72 |
72 |
|
74 |
76 |
80 |
82 |
83 |
In a frequency distribution from 30% to 90% that is divided into six equal-sized intervals, the absolute frequency of the sixth interval is:
The intervals are 30% ≤ x < 40%, 40% ≤ x < 50%, 50% ≤ x < 60%, 60% ≤ x < 70%, 70% ≤ x < 80%, and 80% ≤ x ≤ 90%. There are 3 scores in the range 80% ≤ x ≤ 90%.
作者: bmaggie 时间: 2010-4-9 13:32
Which of the following statements regarding various statistical measures is least accurate?
|
A) |
The correlation coefficient is calculated by dividing the covariance of two random variables by the product of their standard deviations. | |
|
B) |
The coefficient of variation is calculated by dividing the mean by the standard deviation. | |
|
C) |
Variance equals the sum of the squared deviations from the mean times the probability that that each outcome will occur. | |
作者: bmaggie 时间: 2010-4-9 13:32
Which of the following statements regarding various statistical measures is least accurate?
|
A) |
The correlation coefficient is calculated by dividing the covariance of two random variables by the product of their standard deviations. | |
|
B) |
The coefficient of variation is calculated by dividing the mean by the standard deviation. | |
|
C) |
Variance equals the sum of the squared deviations from the mean times the probability that that each outcome will occur. | |
The coefficient of variation equals the standard deviation divided by the mean.
作者: bmaggie 时间: 2010-4-9 13:34
Which of the following is an example of a parameter?
|
A) |
Sample standard deviation. | |
|
|
|
|
作者: bmaggie 时间: 2010-4-9 13:34
Which of the following is an example of a parameter?
|
A) |
Sample standard deviation. | |
|
|
|
|
A parameter is any descriptive measure of a population characteristic. The population variance describes a population while the sample standard deviation and sample mean are each descriptive measures of samples.
作者: bmaggie 时间: 2010-4-9 13:35
A summary measure of a characteristic of an entire population is called a:
作者: bmaggie 时间: 2010-4-9 13:35
A summary measure of a characteristic of an entire population is called a:
A parameter measures a characteristic of the underlying population.
作者: bmaggie 时间: 2010-4-9 13:35
Which of the following statements regarding frequency distributions is least accurate? Frequency distributions:
|
A) |
summarize data into a relatively small number of intervals. | |
|
B) |
work with all types of measurement scales. | |
|
C) |
organize data into overlapping groups. | |
作者: bmaggie 时间: 2010-4-9 13:35
Which of the following statements regarding frequency distributions is least accurate? Frequency distributions:
|
A) |
summarize data into a relatively small number of intervals. | |
|
B) |
work with all types of measurement scales. | |
|
C) |
organize data into overlapping groups. | |
Data in a frequency distribution must belong to only one group or interval. Intervals are mutually exclusive and non-overlapping.
作者: bmaggie 时间: 2010-4-9 13:36
Which of the following best describes a frequency distribution? A frequency distribution is a grouping of:
|
A) |
selected data into intervals (classes) so that the number of observations in each of the non-overlapping intervals (classes) can be seen and tallied. | |
|
B) |
data into intervals (classes) so that the number of observations in each of the non-overlapping intervals (classes) can be seen and tallied. | |
|
C) |
independent intervals (classes) so that they can be seen and tallied. | |
作者: bmaggie 时间: 2010-4-9 13:37
Which of the following best describes a frequency distribution? A frequency distribution is a grouping of:
|
A) |
selected data into intervals (classes) so that the number of observations in each of the non-overlapping intervals (classes) can be seen and tallied. | |
|
B) |
data into intervals (classes) so that the number of observations in each of the non-overlapping intervals (classes) can be seen and tallied. | |
|
C) |
independent intervals (classes) so that they can be seen and tallied. | |
A frequency distribution is a tabular presentation of statistical data that aids the analysis of large data sets.
作者: zaestau 时间: 2010-4-26 18:22
c
作者: kison 时间: 2010-8-24 21:02
xx
| 欢迎光临 CFA论坛 (http://forum.theanalystspace.com/) |
Powered by Discuz! 7.2 |