Deck 2: Descriptive Statistics: Tabular and Graphical Methods

Question 1

A stem-and-leaf display is a graphical portrayal of a data set that shows the data set's overall pattern of variation.

Answer 1

True

Question 2

A bar chart is a graphic that can be used to depict qualitative data.

Answer 2

True

Question 3

A plot of the values of two variables is a _____ plot.

A)Runs
B)Scatter
C)Dot
D)Ogive plot

Answer 3

B

Question 4

A scatter plot can be used to identify outliers.

Question 5

All of the following are used to describe quantitative data except the

A)Histogram
B)Stem and Leaf
C)Dot Plot
D)Pie Chart

Question 6

________ can be used to study the relationship between two variables.

A)Crosstabulation tables
B)Frequency tables
C)Cumulative frequency distributions
D)Dot plots

Question 7

A(n)______ is a graph of a cumulative distribution.

A)Histogram
B)Scatter plot
C)Ogive plot
D)Pie Chart

Question 8

Row or column percentages can be found in:

A)Frequency tables
B)Relative frequency tables
C)Crosstabulation tables
D)Cumulative frequency tables

Question 9

A ______________ displays the frequency of each group with qualitative data and a _____________ displays the frequency of each group with quantitative data.

A)Histogram,stem and leaf display
B)Bar chart,histogram
C)Scatter plot,bar chart
D)Stem and leaf,pie chart

Question 10

An observation separated from the rest of the data is a(n)

A)Absolute extreme
B)Outlier
C)Mode
D)Quartile

Question 11

The relative frequency is the frequency of a class divided by the total number of measurements.

Question 12

When grouping a large sample of items into classes,the ______________ is a better tool than the ___________.

A)Histogram,stem and leaf display
B)Box plot,histogram
C)Stem and Leaf display,scatter plot
D)Scatter plot,box plot

Question 13

Stem-and-leaf displays and dot plots are useful for detecting outliers.

Question 14

When we wish to summarize the proportion (or fraction)of items in a class we use the frequency distribution for each class.

Question 15

When establishing the classes for a frequency table it is generally agreed that the more classes you use the better your frequency table will be.

Question 16

A frequency table includes row and column percentages.

Question 17

Which of the following graphs is for qualitative data?

A)Histogram
B)Bar Chart
C)Ogive plot
D)Stem and leaf

Question 18

When looking at the shape of the distribution using a stem-and-leaf,a distribution is skewed to the right when the left tail is shorter than the right tail.

Question 19

A Stem and Leaf display is best used to

A)Provide a point estimate of the variability of the data set.
B)Provide a point estimate of the central tendency of the data set.
C)Display the shape of the distribution.
D)None of the above.

Question 20

The sample cumulative distribution function is non-decreasing.

Question 21

Which one of the following statistical tools is used with quantitative data?

A)Bar chart
B)Histogram
C)Pie chart
D)Pareto chart

Question 22

If there are 130 values in a data set,how many classes should be created for a frequency histogram?

A)4
B)5
C)6
D)7
E)8

Question 23

All of the following are used to describe qualitative data except the:

A)Bar chart
B)Pie chart
C)Histogram
D)Pareto Chart

Question 24

The US local airport keeps track of the percentage of flights arriving within 15 minutes of their scheduled arrivals.The stem-and-leaf plot of the data for one year is below: In developing a histogram of these data,how many classes would be used?

A)4
B)5
C)6
D)7
E)8

Question 25

If there are 62 values in a data set,how many classes should be created for a frequency histogram?

A)4
B)5
C)6
D)7
E)8

Question 26

A CFO is looking at how much of a company's resources are spent on computing.He samples companies in the pharmaceutical industry and developed the following stem-and-leaf graph. What is the approximate shape of the distribution of the data?

A)Normal
B)Skewed to the right
C)Skewed to the left
D)Bimodal
E)Uniform

Question 27

A CFO is looking at how much of a company's resources are spent on computing.He samples companies in the pharmaceutical industry and developed the following stem-and-leaf graph. If a frequency histogram were to be created using these data,how many classes would you create?

A)4
B)5
C)6
D)7
E)8

Question 28

If there are 120 values in a data set,how many classes should be created for a frequency histogram?

A)4
B)5
C)6
D)7
E)8

Question 29

The US local airport keeps track of the percentage of flights arriving within 15 minutes of their scheduled arrivals.The stem-and-leaf plot of the data for one year is below: How many flights were used in this plot?

A)7
B)9
C)10
D)11
E)12

Question 30

Which of the following graphical tools is not used to study the shapes of distributions?

A)Stem-and-Leaf display
B)Scatter plot
C)Histogram
D)Dot plot

Question 31

A CFO is looking at how much of a company's resources are spent on computing.He samples companies in the pharmaceutical industry and developed the following stem-and-leaf graph. What is the smallest percent spent on R&D?

A)5.9
B)5.6
C)5.2
D)5.02
E)50.2

Question 32

If there are 30 values in a data set,how many classes should be created for a frequency histogram?

A)4
B)5
C)6
D)7
E)8

Question 33

A CFO is looking at how much of a company's resources are spent on computing.He samples companies in the pharmaceutical industry and developed the following stem-and-leaf graph. What would be the first class interval for the frequency histogram?

A)5.2 - 6.5
B)5.2 - 6.0
C)5.0 - 6.0
D)5.2 - 6.6
E)5.2 - 6.4

Question 34

A company collected the ages from a random sample of its middle managers with the resulting frequency distribution shown below: What would be the approximate shape of the relative frequency histogram?

A)Symmetrical
B)Uniform
C)Multiple peak
D)Skewed to the left
E)Skewed to the right

Question 35

When developing a frequency distribution the class (group),intervals should be

A)large.
B)small.
C)integer.
D)mutually exclusive.
E)equal.

Question 36

A CFO is looking at how much of a company's resources are spent on computing.He samples companies in the pharmaceutical industry and developed the following stem-and-leaf graph. What would be the class length that would be used in creating a frequency histogram?

A)1.4
B)8.3
C)1.2
D)1.7
E)0.9

Question 37

The US local airport keeps track of the percentage of flights arriving within 15 minutes of their scheduled arrivals.The stem-and-leaf plot of the data for one year is below: What would be the class length for creating the frequency histogram?

A)1.4
B)0.8
C)2.7
D)1.7
E)2.3

Question 38

A ______________ shows the relationship between two variables.

A)Stem-and-leaf
B)Bar chart
C)Histogram
D)Scatter Plot
E)Pie chart

Question 39

______________ and _____________ are used to describe qualitative (categorical)data.

A)Stem and leaf displays,scatter plots
B)Scatter plots,histograms
C)Box plots,bar charts
D)Bar charts,pie charts
E)Pie charts,histograms

Question 40

A ______________ can be used to differentiate the "vital few" causes of quality problems from the "trivial many" causes of quality problems.

A)Histogram
B)Scatter plot
C)Pareto chart
D)Ogive plot
E)Stem and leaf display

Question 41

822 customers were randomly selected from those who had recently bought a book over the internet.The chart below shows the breakdown of the classification of the book type: What percentages of books were in the top two categories?

A)22.99
B)20.44
C)4.50
D)43.43
E).4343

Question 42

The 550 students answered an additional question with the following results based on their rating of their instructor: What proportion of the students who rated their instructor as very or somewhat effective received a B or better in the class?

A)0.345
B)0.254
C)0.482
D)0.898
E)0.644

Question 43

The 550 students answered an additional question with the following results based on their rating of their instructor: What proportion of all 550 students received less than a C?

A)0.03
B)0.06
C)0.08
D)0.13
E)0.15

Question 44

A __________ can be used to differential the "vital few" causes of quality problems from the "trivial many" causes of quality problems.

A)Pareto chart
B)Bar chart
C)Ogive plot
D)Cross tabulation table

Question 45

822 customers were randomly selected from those who had recently bought a book over the internet.The chart below shows the breakdown of the classification of the book type: What percentage of the books purchased were self-help books?

A)11.44%
B).1144%
C)1.82%
D)0.0182%
E)0.940%

Question 46

A company collected the ages from a random sample of its middle managers with the resulting frequency distribution shown below: What is the relative frequency for the largest interval?

A).132
B).226
C).231
D).283
E).288

Question 47

Using the following data,describe the shape of the data distribution.

A)Skewed to the left
B)Bi-model
C)Normal
D)Skewed to the right

Question 48

The number of measurements falling within a class interval is called the _____.

A)Frequency
B)Relative frequency
C)Leaf
D)Cumulative sum

Question 49

A ________ is a graph of cumulative distribution.

A)Bar chart
B)Relative frequency histogram
C)Frequency histogram
D)Ogive plot

Question 50

A flaw possessed by a population or sample unit is _____.

A)always random
B)a defect
C)displayed by a dot plot
D)the cause for extreme skewness to the right

Question 51

A histogram that tails out towards larger values is _____.

A)Skewed to the left
B)Normal
C)A scatterplot
D)Skewed to the right

Question 52

A histogram that tails out towards smaller values is _____.

A)Skewed to the left
B)Normal
C)A scatterplot
D)Skewed to the right

Question 53

A graphical portrayal of a data set that divides the data into classes and gives the frequency of each class is a(n)_____.

A)Ogive Plot
B)Dot Plot
C)Histogram
D)Pareto Chart
E)Bar Chart

Question 54

A(n)___________ is a graphical display of categorical data made up of vertical or horizontal bars.

A)Pareto chart
B)Bar chart
C)Ogive plot
D)Histogram

Question 55

822 customers were randomly selected from those who had recently bought a book over the internet.The chart below shows the breakdown of the classification of the book type: What percentage of the books purchased were either mystery or science fiction/fantasy?

A)18.61
B)36.50
C)17.88
D)24.33
E)22.99

Question 56

Using the following data,what would be the range of the values of the stem in a stem and leaf display?

A)11-17
B)11-18
C)10-18
D)12-17
E)12-18

Question 57

A graphical display of categorical data made up of vertical or horizontal bars is called a _____.

A)Pie Chart
B)Pareto Chart
C)Bar Chart
D)Ogive Plot

Question 58

The percentage of measurements in a class is called the _____ of that class.

A)Frequency
B)Relative frequency
C)Leaf
D)Cumulative percentage

Question 59

A relative frequency curve having a long tail to the right is said to be _____.

A)Skewed to the left
B)Normal
C)A scatterplot
D)Skewed to the right

Question 60

A company collected the ages from a random sample of its middle managers with the resulting frequency distribution shown below: What is the midpoint of the third class interval?

A)22.5
B)27.5
C)32.5
D)37.5
E)42.5

Question 61

Consider the following data: Create a stem and leaf display for the sample.
Stem and leaf of C1,N = 20 Leaf Unit = 0.10

Question 62

Recently an advertising company called 200 people and asked to identify the company that was in an ad running nationwide.The following results were obtained: What percentage of those surveyed were female and could not recall the company?

A)40.0%
B)22.0%
C)52.4%
D)66.7%
E)37.9%

Question 63

Consider the following data on distances traveled by people to visit the local amusement park and calculate the relative frequency for the distances over 24 miles.

A).375
B).150
C).125
D).025
E).325

Question 64

The following is a partial relative frequency distribution of grades in an introductory statistics course. Find the relative frequency for B grade

A).78
B).27
C).65
D).37
E).47

Question 65

The number of items rejected daily by a manufacturer because of defects for the last 30 days are: 20,21,8,17,22,19,18,19,14,17,11,6,21,25,4,19,9,12,16,16,10,28,24,6,21,20,25,5,17,8
Complete this frequency table for these data

Question 66

The following is a relative frequency distribution of grades in an introductory statistics course. If this was the distribution of 200 students,find the frequency of failures:

A)12
B)6
C)23
D)46
E)3

Question 67

The local electronics retailer has recently conducted a study on purchasers of large screen televisions.The study recorded the type of television and the credit account balance of the customer at the time of purchase.The following results were obtained: What percentage of purchases were Plasma televisions by customers with the smallest credit balances?

A)50.00%
B)39.20%
C)56.30%
D)34.80%
E)19.6%

Question 68

The following is a relative frequency distribution of grades in an introductory statistics course. If this was the distribution of 200 students,find the frequency for the highest two grades:

A)44
B)118
C)59
D)74
E)35

Question 69

Consider the following data on distances traveled by people to visit the local amusement park and calculate the relative frequency for the shortest distance.

A).375
B).150
C).500
D).300
E).333

Question 70

The number of items rejected daily by a manufacturer because of defects for the last 30 days are: 20,21,8,17,22,19,18,19,14,17,11,6,21,25,4,19,9,12,16,16,10,28,24,6,21,20,25,5,17,8
Construct a stem-and-leaf plot.

Question 71

The local electronics retailer has recently conducted a study on purchasers of large screen televisions.The study recorded the type of television and the credit account balance of the customer at the time of purchase.The following results were obtained: What percentage of the customers with the highest credit balances purchased an LCD television?

A)36.30%
B)5.90%
C)19.60%
D)56.30%
E)16.20%

Question 72

The number of items rejected daily by a manufacturer because of defects for the last 30 days are: 20,21,8,17,22,19,18,19,14,17,11,6,21,25,4,19,9,12,16,16,10,28,24,6,21,20,25,5,17,8 How many classes should be used in the construction of a histogram?

A)6
B)5
C)7
D)4
E)8

Question 73

The number of items rejected daily by a manufacturer because of defects for the last 30 days are: 20,21,8,17,22,19,18,19,14,17,11,6,21,25,4,19,9,12,16,16,10,28,24,6,21,20,25,5,17,8
Construct an Ogive plot

Question 74

Consider the following data on distances traveled by people to visit the local amusement park. Construct an Ogive plot that corresponds to the frequency table.

Question 75

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below:
24,56,43,35,37,27,29,44,34,28,33,28,46,31,38,41,48,38,27,29,37,33,31,40,50
Construct an Ogive plot

Question 76

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below: 24,56,43,35,37,27,29,44,34,28,33,28,46,31,38,41,48,38,27,29,37,33,31,40,50
How many classes should be used in the construction of a histogram?

A)4
B)6
C)10
D)5
E)2

Question 77

The following is a relative frequency distribution of grades in an introductory statistics course. If this was the distribution of 200 students,give the frequency distribution for this data:

Question 78

Recently an advertising company called 200 people and asked to identify the company that was in an ad running nationwide.The following results were obtained: What percentage of those surveyed could not correctly recall the company?

A)58.00%
B)56.89%
C)55.00%
D)43.10%
E)42.00%

Question 79

Using the following data,what would be the leaf unit in a stem and leaf display?

A)1.0
B)10
C).10
D).01
E).20

Question 80

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below: 24,56,43,35,37,27,29,44,34,28,33,28,46,31,38,41,48,38,27,29,37,33,31,40,50
What is the shape of the distribution of the data?

A)Skewed with tail to the right
B)Skewed with tail to the left
C)Normal
D)Bi-model