Question 1

What could be done to make the information in this graph more clear?

Accepted Answer

A)  Use a stacked histogram. 
B)  Identify actual days of the week rather than just number. 
C)  Use a population pyramid. 
D)  Identify if visitors were male, female or children and who they were visiting. B

Question 2

What conclusion can be drawn from the data provided in the figure below in relation to sleep and cigarette smoking?

Accepted Answer

A)  Those who smoked least slept least. 
B)  Those who smoked most slept least. 
C)  Those who smoked most slept most. 
D)  Those who smoked least slept most. D

Question 3

For which of the following sets of variables would you not use a scatterplot in order to show your data?

Accepted Answer

A)  An individual's rating of pain on a scale and the amount of analgesia taken 
B)  Raised body temperature and level of depression 
C)  Numbers of children having measles immunization and incidence of measles illness 
D)  The number of people attending a nursing home on a Saturday D

Question 4

I collected some data about how much buyers of my book liked it (on a scale of 1 = it's utter rubbish to 10 = I never read anything else). I ended up with a sample of 15,467 people. When I looked at the distribution, I found a skew of 1.23 (SE = 0.65). The mean rating was 4.78. What is the z-score for the skew of my data?

Accepted Answer

A)  1.89 
B)  0.53 
C)  -3.92 
D)  3.36

Question 5

What does the information in the following boxplot tell you about the surviving infants of severe idiopathic respiratory distress syndrome?   Birthweights of infants with severe idiopathic respiratory distress syndrome (SIRDS)

Accepted Answer

A)  The median birthweight is lower for those who died. 
B)  The mean birthweight is higher for those who survived. 
C)  The median birthweight is greater than those who died. 
D)  The mean birthweight is lower for those who survived.

Question 6

The following figure is drawn from Schoenborn, C. A. and Adams, P. F. (2008, May). Sleep duration as a correlate of smoking, alcohol use, leisure-time physical inactivity, and obesity among adults: United States, 2004-2006. Hyattsville, MD: National Center for Health Statistics. It is available via HYPERLINK "http://www.cdc.gov/nchs" http://www.cdc.gov/nchs. What type of bar charts are shown in the figure?

Accepted Answer

A)  Stacked bar charts 
B)  Clustered bar charts 
C)  Clustered bar charts with error bars 
D)  None of the above

Question 7

What type of graph is shown below?

Accepted Answer

A)  Frequency polygon 
B)  Stacked histogram 
C)  Simple histogram 
D)  Frequency distribution

Question 8

What does this graph tell you about those who had five or more drinks in one day?

Accepted Answer

A)  Those who drank most, slept most. 
B)  Those who drank least, slept least. 
C)  Those who drank most, slept least. 
D)  None of the above.

Question 9

Which of the following is not recommended when displaying information graphically?

Accepted Answer

A)  Minimum use of ink 
B)  Use of 3-D effects 
C)  Informative labelling of each axis 
D)  Minimizing the number of distractions

Question 10

What conclusion can be drawn from the boxplot below?

Accepted Answer

A)  More infants with SIRDS survived than died. 
B)  Infant survival in cases of SIRDS is related to birthweight. 
C)  Deaths of SIRDS were higher than survivors. 
D)  None of the above.

Question 11

What statement best describes what is shown in the graph below?

Accepted Answer

A)  There were 46 hospital visitors visiting during the week. 
B)  There were 48 visitors to the hospital in a week. 
C)  Day 1 is the most popular day for visiting. 
D)  Day 6 has the least number of visitors.

Question 12

Which of the following does a box-whisker plot not display

Accepted Answer

A)  The range 
B)  The interquartile range 
C)  The lower quartile 
D)  The mean

Exam 5: Exploring Data With Graphs