Reading 7: Statistical Concepts and Market Returns - LOS b

答案和详解如下：

1、Given the following frequency distribution:

Which of the following statements is FALSE?

A)   The interval size is 20.

B)   The relative interval frequency of the second interval is 14.28.

C)   The interval frequency of the third interval is 15.

D)   The mean of the frequency distribution is 51.43.

The correct answer was B)

The relative interval frequency is (interval frequency) / (total number) = 28.57.

2、Which of the following best describes a frequency distribution? A frequency distribution is a grouping of:

A)   data into intervals (classes) so that the number of observations in each of the non-overlapping intervals (classes) can be seen and tallied.

B)   selected data into intervals (classes) so that the number of observations in each of the non-overlapping intervals (classes) can be seen and tallied.

C)   dependent intervals (classes) so that they can be seen and tallied.

D)   independent intervals (classes) so that they can be seen and tallied.

The correct answer was A)

A frequency distribution is a tabular presentation of statistical data that aids the analysis of large data sets.

3、Which of the following statements regarding frequency distributions is FALSE? Frequency distributions:

A)   help in the analysis of large amounts of statistical data.

B)   organize data into overlapping groups.

C)   work with all types of measurement scales.

D)   summarize data into a relatively small number of intervals.

The correct answer was B)    

Data in a frequency distribution must belong to only one group or interval. Intervals are mutually exclusive and non-overlapping.

4、A summary measure of a characteristic of an entire population is called a:

A)   census.

B)   statistic.

C)   parameter.

D)   summary.

The correct answer was C)

A parameter measures a characteristic of the underlying population.

5、Which of the following is an example of a parameter?

A)   Population variance.

B)   Sample standard deviation.

C)   Sample mean.

D)   Sample mode.

The correct answer was A)

A parameter is any descriptive measure of a population characteristic. The population variance describes a population while the sample standard deviation, sample mean, and sample mode are each descriptive measures of samples.

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