Reading 7: Statistical Concepts and Market Returns-LOS b习题 2010, frequency, highest, center, style

bmaggie

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:

A) 2.

B) 4.

C) 3.

kison

xx

zaestau

c

bmaggie

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.

bmaggie

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.

 

bmaggie

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

A) parameter.

B) statistic.

C) census.

bmaggie

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

A) parameter.

B) statistic.

C) census.

---

A parameter measures a characteristic of the underlying population.

bmaggie

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.

bmaggie

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.

bmaggie

Which of the following is an example of a parameter?

A) Sample standard deviation.

B) Population variance.

C) Sample mean.