Answers and multiple choice questions on probability and statistics

Quantitative data Question: A population is:... Scatter diagram Question: If a data set has an even number of observations, the median: a.. Is the average value of the two middle items w

Question: In a data set that contains outliers, which of thefollowing is the least appropriate measure of central

Question: Which of the following is not an example of a firm that sells or provides business data?

a Census Bureau

b Bloomberg

c Dow Jones & Co

d Dun & Bradstreet

Question: Arithmetic operations are inappropriate for:

a Large data sets

b Both categorical and quantitative data

c Categorical data

d Quantitative data

Question: A population is:

a Always the same size as the sample

b The selection of a random sample

c The collection of all items of interest in a particular study

d The same as a sample

Question: Before drawing any conclusions about the relationship between the variables shown in a cross-tabulation, you should:

a Construct a dot plot and look for significant gaps

b Investigate whether any hidden variables could affect the conclusion

c Construct a scatter diagram and find the trendline

d Develop a relative frequency distribution

Question: Income is an example of a variable that uses the:

a Transformation

b Drilling down

c Root-cause analysis

d Data trimming

Question: A display used to compare the frequency, relative frequency, or percent frequency of categorical variables is a:

a Stacked bar chart

b Pie chart

c Stem-and-leaf display

d Scatter diagram

Question: If a data set has an even number of

observations, the median:

a Cannot be determined

b Is the average value of the two middle items

c Must be equal to the mean

d Is the average value of the two middle items when all items are arranged in order

Question: The geometric mean of five observations is the:

a Square root of the product of the 5 observations

b Same as their weighted mean

c Fifth root of the product of the 5 observations

d Same as their mean

Question: A characteristic of interest for the elements is called a:

a Sample

Question: The mean of a sample:

a Is always smaller than the mean of the population

b Is computed by summing the data values and dividing the sum by

c Is computed by summing all the data values and

dividing the sum by the number of items

d Is always equal to the mean of the population

Question: Which of the following graphical methods shows the relationship between two variables:

a Histogram

b Pie chart

c Dot plot

d Cross-tabulation

Question: Growth factors for the population of

Chattanooga in the past two years have been 8 and 12 The geometric mean has a value of:

a 20

b 36

c 30

d 96

Question: The numerical value of the variance:

a Is negative if the mean is negative

b Is always larger than the numerical value of the standard deviation

c Can be larger or smaller than the numerical value of the standard deviation

d Is always smaller than the numerical value of the standard deviation

Question: Dr Kurt Thearling, a leading practitioner in the field, defines data mining as "the extraction of information from databases."

Question: From a population of size 400, a random sample of 40 items is selected The median of the

sample:

a Must be 200, since 400 divided by 2 is 200

b Must be equal to the median of the population, if the sample is truly random

c Must be 10, since 400 divided by 40 is 10

d None of these alternatives are correct

Question: If the coefficient of variation is

Question: Different methods of developing useful

information from large databases are designed under:

a Data manipulation

b Data warehousing

c Big data

d Data mining

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· Question: In a data set that contains outliers, which

of the following is the least appropriate measure of central tendency?

c Diphtheria

d Cholera

· Question: Which of the following is not an example

of a firm that sells or provides business data?

a Census Bureau

b Bloomberg

c Dow Jones & Co

d Dun & Bradstreet

· Question: Arithmetic operations are inappropriate for:

a Large data sets

b Both categorical and quantitative data

c Categorical data

d Quantitative data

· Question: A population is:

a Always the same size as the sample

b The selection of a random sample

c The collection of all items of interest in a

particular study

d The same as a sample

· Question: Before drawing any conclusions about the relationship between the variables shown in a cross-tabulation, you should:

a Construct a dot plot and look for significant gaps

b Investigate whether any hidden variables could affect the conclusion

c Construct a scatter diagram and find the trendline

d Develop a relative frequency distribution

· Question: Income is an example of a variable that uses the:

a Nominal scale

b Ratio scale

c Interval scale

d Ordinal scale

· Question: A group of students had dinner at a local restaurant The total bill for the dinner was 344.79 Each student paid his/her equal share of the bill,

which was 18.85 How many students were at the dinner?

· Question: Functionality in interactive data

dashboards that allows the user to access and analyze data at an increasingly detailed level is referred to as:

· Question: If a data set has an even number of

observations, the median:

a Cannot be determined

b Is the average value of the two middle items

c Must be equal to the mean

d Is the average value of the two middle items

when all items are arranged in order

· Question: The geometric mean of five observations

is the:

a Square root of the product of the 5 observations

b Same as their weighted mean

c Fifth root of the product of the 5 observations

d Same as their mean

· Question: A aracteristic of interest for the elements

· Question: Which of the following graphical

methods shows the relationship between two

b Is always larger than the numerical value of the standard deviation





c Can be larger or smaller than the numerical value

of the standard deviation

· Question: Dr Kurt Thearling, a leading

practitioner in the field, defines data mining as "the extraction of information from databases."

 ·

a Timely, accurate





b Must be equal to the median of the population,

if the sample is truly random





c Must be 10, since 400 divided by 40 is 10

· Question: Different methods of developing useful information from large databases are designed under: