Question:

Under what circumstances should we be cautious about using the mean as a measure ofcentral tendency?

A.

when the data is skewed.

B.

when data is positively skewed

C.

when data is negatively skewed

D.

all of the above

Answer» d. all of the above

Question:

Which of the following sampling techniques will not result in a probability sample?

A.

stratified

B.

quota

C.

random

D.

systematic

Answer» b. quota

Question:

The following integers were obtained as the number of visits to a gift shop, per hour, overseveral days. the mean of the above data, to 2 decimal places.

A.

2.80

B.

3.00

C.

2.81

D.

2.8

Answer» c. 2.81

Question:

A researcher finds a correlation of 0.40 between personal income and the number ofyears of college completed. Based upon this finding he can conclude that

A.

a person who attended four years of college will have an annual income of rs. 40,000

B.

more years of education causes higher income

C.

personal income is a positively skewed variable

D.

more years of education are associated with higher income

Answer» d. more years of education are associated with higher income

Question:

The grades that a random sample of BA students received over the last five years inQuantitative Techniques examinations represent what statistical concept

A.

the grades are a parameter

B.

the grades are a statistic

C.

the grades are a sample

D.

the grades are a population

Answer» c. the grades are a sample

Question:

Index nos. are often constructed from the

A.

frequency

B.

class

C.

sample

D.

none

Answer» c. sample

Question:

Which of the following definitions is the definition of the MEAN

A.

the mean is the largest value

B.

the mean is the value that half of the entries are below and half of the entries are above

C.

the mean is the value that has the highest frequency

D.

the mean is the average calculated by adding up all the values and dividing by the number

Answer» d. the mean is the average calculated by adding up all the values and dividing by the number

Question:

What is the purpose of a summary table?

A.

to see differences between or among categories

B.

to list data to create a bar or pie chart

C.

this is the only way to present categorical data in numerical form

D.

to sum the values of responses to a survey

Answer» a. to see differences between or among categories

Question:

The index no. is a special type of average

A.

false

B.

true

C.

both

D.

none

Answer» b. true

Question:

The width of a class interval in a frequency distribution (or bar chart) will beapproximately equal to the range of the data divided by the ______________ .

A.

highest value in the data set

B.

average of the data set

C.

lowest value in the data set

D.

number of class intervals

Answer» d. number of class intervals