Mid Term Exam- Chapter 2

A situation in which conclusions based upon aggregated cross-tabulation are different from not aggregated cross-tabulations is known as a. wrong cross-tabulation b. Simpson's rule c. Simpson's paradox d. aggregated cross-tabulation

Simpson's paradox

A tabular method that can be used to summarize the data on two variables simultaneously is called a. simultaneous equations b. cross-tabulation c. a histogram d. an frequency distribution

cross-tabulation

Refer to Exhibit 2-1. The proportion (fraction) of business students working 9 hours or less is a. 20 b. 9 c. 0.95 d. 0.05

0.05

Refer to Exhibit 2-2. What proportion of the students' undergraduate major is engineering? a. 0.290 b. 0.520 c. 0.650 d. 0.365

0.365

Refer to Exhibit 2-2. Among the students who plan to go to graduate school, what proportion indicated "Other" majors? a. 0.16 b. 0.45 c. 0.54 d. 0.35

0.45

Refer to Exhibit 2-1. The cumulative relative frequency for the 20 - 29 class is a. is 300 b. is 0.25 c. is 0.75 d. is 0.5

0.75

Refer to Exhibit 2-2. Of those students who are majoring in business, what percentage plans to go to graduate school? a. 27.78 b. 8.75 c. 70 d. 72.22

27.78

. Refer to Exhibit 2-2. What percentage of the students does not plan to go to graduate school? a. 280 b. 520 c. 65 d. 32

65

. Refer to Exhibit 2-1. The percentage of business students working at least 10 hours per week is a. 80% b. 85% c. 90% d. 95%

95%

A histogram is a graphical presentation of a. a frequency or relative frequency distribution of a quantitative data b. a cumulative frequency or a cumulative relative frequency distribution c. a graphical presentation of the history of data d. a frequency or relative frequency distribution of a categorical data

a frequency or relative frequency distribution of a quantitative data

What type of relationship is depicted in the following scatter diagram? a. no apparent relationship b. a straightforward relationship c. a positive relationship d. a negative relationship

a negative relationship (downward sloping)

A graphical presentation of the relationship between two quantitative variables is a. a pie chart b. a histogram c. a bar chart d. a scatter diagram

a scatter diagram

A frequency distribution is a. a tabular summary of a data set showing the relative frequency b. a graphical form of representing data c. a tabular summary of a data set showing the frequency of items in each of several non-overlapping classes d. a graphical device for presenting qualitative data

a tabular summary of a data set showing the frequency of items in each of several non-overlapping classes

In constructing a frequency distribution for quantitative data, the approximate class width is computed as a. (largest data value - smallest data value)/(number of classes) b. (largest data value - smallest data value)/(sample size) c. (smallest data value - largest data value)/(sample size) d. (largest data value)/(number of classes)

a. (largest data value-smallest data value) / (number of classes)

A cumulative relative frequency distribution shows a. the proportion of data items with values less than or equal to the upper limit of each class b. the proportion of data items with values less than or equal to the lower limit of each class c. the percentage of data items with values less than or equal to the upper limit of each class d. the percentage of data items with values less than or equal to the lower limit of each class

a. the proportion of data items with values less than or equal to the upper limit of each class

go over Exhbit 2-1 and know how to do:

frequency distribution and bar graph relative frequency distribution and pie chart (look at test bank to see how)

What type of relationship is depicted in the following scatter diagram? a. no apparent relationship b. a straightforward relationship c. a positive relationship d. a negative relationship

no apparent relationship (points scattered all over)

Bar charts and pie charts are used to summarize a. interval and ratio data b. nominal and interval data c. ordinal and ratio data d. nominal and ordinal data

nominal and ordinal data

The sum of the relative frequencies for all classes will always equal a. the sample size b. the number of classes c. one d. any value greater than one

one

The relative frequency of a class is computed by dividing a. the cumulative frequency of the class by the number of data items b. the percent frequency of the class by the number of data items c. the frequency of the class by the number of data items d. the frequency of the class by the number of classes

the frequency of the class by the number of data items

The sum of frequencies for all classes will always equal a. 1 b. the number of items in a data set c. the number of classes d. a value between 0 and 1

the number of items in a data set