Deck 4: Frequency Distributions and Charts

Question 1

Why might a Lorenz curve provide a suitable way to compare the distribution of wealth in the UK, US and Japan?

A) It can be used to compare multiple variables at the same time
B) It can be used to show how a variable is shared amongst subjects in a population
C) It can be used to illustrate the rate of change of a variable through time
D) It can be used to evaluate distribution of variables in different sized classes

Answer 1

It can be used to show how a variable is shared amongst subjects in a population

Question 2

Which of the following is NOT true of grouped frequency distributions?

A) It is usual to aim for 8 to 10 classes in total
B) Classes should be displayed in size order
C) Classes must always have equal width
D) Each data point must be in one, and only one, class

Answer 2

Classes must always have equal width

Question 3

Which of the following is the best description of a histogram?

A) Joined, horizontal bars, each bar representing a class
B) Joined, vertical bars, each bar representing a class
C) Unjoined, vertical bars, each bar representing a class
D) Unjoined, horizontal bars, each bar representing a class

Answer 3

Joined, vertical bars, each bar representing a class

Question 4

Estimate the total value for a class with limits 20 to 29 and a frequency of 14

A) 343
B) 350
C) 357
D) 364

Question 5

Why might a cumulative frequency distribution be useful in monitoring the number of apples in each bag of pre-packed fruit?

A) It gives an indication of the number of items with fewer than a specified number of fruit
B) This type of data is not suitable for a grouped frequency distribution
C) This distribution helps minimise errors in interpretation by managers
D) It is required in order to enable statistical analysis at a later stage

Question 6

For which of these examples of data would a frequency distribution be most useful?

A) Analysis of the lengths of copper tubing cut in a factory
B) Average weights of shipping containers
C) Count of the number of cars carrying passengers to a work car park
D) Duration spent in the gift shop by visitors to a tourist attraction

Question 7

What term best describes numerical data that have been carefully collected but not yet worked on?

A) Primary data
B) Quantitative data
C) Discrete data
D) Raw data

Question 8

Which of the following is NOT an appropriate way to represent a frequency distribution pictorially?

A) Frequency polygon
B) Bar Chart
C) Histogram
D) Frequency Curve

Question 9

The analysis of information from a large sales team results in a frequency distribution showing the number of appointments with clients each week. One class is 10 to 14 appointments. What is the mid-point of this class?

A) 11.5
B) 12
C) 12.5
D) 13

Question 10

What is the best way to deal with a frequency distribution that has a large number (more than 20) distinct data values?

A) Construct a grouped frequency distribution
B) Ignore the highest and lowest values
C) Write a description of the data to explain it more clearly
D) You should not construct a frequency distribution in this case