Econ 210: Ch 1,2,3 Quiz Questions

Which of the following graphical methods is most appropriate for qualitative data? a. pie chart b. scatter diagram c. ogive d. histogram

a. pie chart

Information on the type of industry is provided for a sample of 50 Fortune 500 companies. Industry Type Frequency Banking 7 Consumer Products 15 Electronics 10 Retail 18 Refer to Exhibit 2-2. The relative frequency of industries that are classified as banking is a. 0.14 b. 0.07 c. 0.70 d. 7

a. 0.14

The numbers of hours worked (per week) by 400 statistics students are shown below. Number of hours, Frequency 0-9, 20 10-19, 80 20-29, 200 30-39, 100 Refer to Exhibit 2-1. The percentage of students working 19 hours or less is a. 25% b. 75% c. 20% d. 80%

a. 25%

A survey of 400 college seniors resulted in the following crosstabulation regarding their undergraduate major and whether or not they plan to go to graduate school. Undergraduate Major Graduate School, Business, Engineering, Others, Total Yes 35 42 63 140 No 91 104 65 260 Total 126 146 128 400 Refer to Exhibit 2-4. Of those students who are majoring in business, what percentage plans to go to graduate school? a. 27.78 b. 70 c. 72.22 d. 8.75

a. 27.78

A researcher has collected the following sample data. 5 12 6 8 5 6 7 5 12 4 Refer to Exhibit 3-1. The mode is a. 5 b. 8 c. 6 d. 7

a. 5

In a questionnaire, respondents are asked to mark their gender as male or female. Gender is an example of a a. categorical variable b. quantitative variable c. categorical or quantitative variable, depending on how the respondents answered the question d. ratio variable

a. categorical variable

The owner of a factory regularly requests a graphical summary of all employees' salaries. The graphical summary of salaries is an example of a. descriptive statistics b. a sample c. statistical inference d. an experiment

a. descriptive statistics

The numbers of hours worked (per week) by 400 statistics students are shown below. Number of hours, Frequency 0-9, 20 10-19, 80 20-29, 200 30-39, 100 Refer to Exhibit 2-1. The cumulative relative frequency for the class of 20 - 29 a. is 0.75 b. is 300 c. is 0.5 d. is 0.25

a. is 0.75

Categorical data a. may be either numeric or nonnumeric b. indicate either how much or how many c. are always numeric d. are always nonnumeric

a. may be either numeric or nonnumeric

The measure of location that is the most likely to be influenced by extreme values in the data set is the a. mean b. range c. mode d. median

a. mean

Which scale of measurement can be either numeric or nonnumeric? a. nominal and ordinal b. interval c. ordinal d. nominal

a. nominal and ordinal

A numerical measure, such as a mean, computed from a population is known as a a. population parameter b. sample parameter c. sample mean d. sample statistic

a. population parameter

In a questionnaire, respondents are asked to record their age in years. Age is an example of a a. quantitative variable b. categorical or quantitative variable, depending on how the respondents answered the question c. ratio variable d. categorical variable

a. quantitative variable

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

a. the number of elements in a data set

The number observations in a complete data set having 10 elements and 5 variables is a. 5 b. 10 c. 25 d. 50

b. 10

The sum of deviations of the individual data elements from their mean is a. always less than zero b. always equal to zero c. always greater than zero d. sometimes greater than and sometimes less than zero, depending on the data elements

b. always equal to zero

Categorical data a. must be nonnumeric b. are labels used to identify attributes of elements c. can not be numeric d. indicate either how much or how many

b. are labels used to identify attributes of elements

The difference between the lower class limits of adjacent classes provides the a. number of classes b. class width c. class midpoint d. class limits

b. class width

A numerical measure of linear association between two variables is the a. variance b. covariance c. standard deviation d. coefficient of variation

b. covariance

When the data have the properties of ordinal data and the interval between observations is expressed in terms of a fixed unit of measure, the variable has which scale of measurement? a. ordinal b. interval c. nominal d. ratio

b. interval

Which of the following symbols represents the mean of the population? a. s^2 b. m c. s d. x-bar

b. m

The ages of employees at a company represent a. label data b. quantitative data c. categorical data d. time series data

b. quantitative data

In a sample of 3,200 registered voters, 1,440, or 45%, approve of the way the President is doing his job. Refer to Exhibit 1-2. A political pollster states, "Forty five percent of all voters approve of the President." This statement is an example of a. a population b. statistical inference c. descriptive statistics d. a sample

b. statistical inference

The interquartile range is a. the 50th percentile b. the difference between the third quartile and the first quartile c. another name for the variance d. the difference between the largest and smallest values

b. the difference between the third quartile and the first quartile

The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated mean = 160 range = 60 mode = 165 variance = 324 median = 170 The coefficient of variation equals a. 203.12% b. 0.20312% c. 11.25% d. 0.1125%

c. 11.25%

Information on the type of industry is provided for a sample of 50 Fortune 500 companies. Industry Type Frequency Banking 7 Consumer Products 15 Electronics 10 Retail 18 Refer to Exhibit 2-2. The number of industries that are classified as retail is a. 36% b. 0.36 c. 18 d. 32

c. 18

A researcher has collected the following sample data. The mean of the sample is 5. 3 5 12 3 2 Refer to Exhibit 3-2. The interquartile range is a. 12 b. 10 c. 2 d. 1

c. 2

The standard deviation of a sample of 100 observations equals 64. The variance of the sample equals a. 6,400 b. 8 c. 4,096 d. 10

c. 4,096

A Scanner Data User Survey of 50 companies found that the average amount spent on scanner data per category of consumer goods was $387,325 (Mercer Management Consulting, Inc., April 24, 1997). The $387,325 is an example of a. a descriptive statistic b. quantitative data c. Both quantitative data and a descriptive statistic are correct. d. categorical data

c. Both quantitative data and a descriptive statistic are correct

Positive values of covariance indicate a. a positive variance of the y values b. a positive variance of the x values c. a positive relation between the x and the y variables d. the standard deviation is positive

c. a positive relation between the x and the y variables

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

c. a scatter diagram

The correlation coefficient a. cannot be negative b. is the same as the covariance c. cannot be larger than 1 d. can be larger than 1

c. cannot be larger than 1

In constructing a frequency distribution, as the number of classes are decreased, the class width a. remains unchanged b. decreases c. increases d. can increase or decrease depending on the data values

c. increases

The numbers of hours worked (per week) by 400 statistics students are shown below. Number of hours, Frequency 0-9, 20 10-19, 80 20-29, 200 30-39, 100 Refer to Exhibit 2-1. The class width for this distribution a. varies from class to class b. is 39, which is: the largest value minus the smallest value or 39 - 0 = 39 c. is 10 d. is 9

c. is 10

The coefficient of variation indicates how large the standard deviation is relative to the a. median b. variance c. mean d. range

c. mean

A tabular summary of data showing the percentage of items in each of several nonoverlapping classes is a a. frequency distribution b. relative frequency distribution c. percent frequency distribution d. cumulative percent frequency distribution

c. percent frequency distribution

A tabular summary of a set of data showing the fraction of the total number of items in several nonoverlapping classes is a a. cumulative frequency distribution. b. frequency distribution. c. relative frequency distribution. d. frequency.

c. relative frequency distribution

In a sample of 800 students in a university, 160, or 20%, are Business majors. Based on the above information, the school's paper reported that "20% of all the students at the university are Business majors." This report is an example of a. descriptive statistics b. a population c. statistical inference d. a sample

c. statistical inference

Which of the following is not a measure of location? a. mean b. mode c. variance d. median

c. variance

A researcher has collected the following sample data. The mean of the sample is 5. 3 5 12 3 2 Refer to Exhibit 3-2. The standard deviation is a. 13.2 b. 8.944 c. 16.5 d. 4.062

d. 4.062

Data that provide labels or names for groupings of like items are known as a. label data b. quantitative data c. generic data d. categorical data

d. categorical data

When the data are labels or names used to identify an attribute of the elements, the variable has which scale of measurement? a. ordinal b. ratio c. interval d. nominal

d. nominal

Ordinary arithmetic operations are meaningful a. with rank data b. only with categorical data c. either with quantitative or categorical data d. only with quantitative data

d. only with quantitative data

When the data have the properties of interval data and the ratio of two values is meaningful, the variable has which scale of measurement? a. ordinal b. nominal c. interval d. ratio

d. ratio

Which of the following is an example of qualitative data? a. number of square feet of carpet b. score on a multiple-choice exam c. height, in meters, of a diving board d. social security number

d. social security number