Reading 7: Statistical Concepts and Market Returns - LOS b

答案和详解如下：

6、Use the results from the following survey of 500 firms to answer the question.

The width of each interval (class) for this frequency table is:

A)   50.

B)   101.

C)   100.

D)   600.

The correct answer was

Max of interval - Min of interval = 100 C)     

7、Use the results from the following survey of 500 firms to answer the question.

The lower boundary of the fifth interval (class) is:

A)   701.

B)   750.

C)   700.

D)   800.

The correct answer was C)

700 - 800, lower boundary = 700

8、Use the results from the following survey of 500 firms to answer the question.

The cumulative relative frequency of the second interval (400 to 500) is:

A)   20.4%.

B)   10.2%.

C)   36.0%.

D)   12.4%.

The correct answer was A)    

62 + 40 = 102, 102/500 = .204 or 20.4%

9、Use the results from the following survey of 500 firms to answer the question.

The frequency of the third class is:

A)   156.

B)   78.

C)   180.

D)   500.

The correct answer was B)

The third class is 500 - 600 with a frequency of 78.

10、Use the results from the following survey of 500 firms to answer the question.

The number of classes in this frequency table is:

A)   6.

B)   5.

C)   100.

D)   600.

The correct answer was A)

300 - 400 = 1, 400 - 500 = 2, 500 - 600 = 3, 600 - 700 = 4, 700 - 800 = 5, 800 - 900 = 6, Total = 6