Question 1

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

Accepted Answer

C

Question 2

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

Accepted Answer

The z-score for the skew is calculated by dividing the skew by its standard error: 1.23 / 0.65 = 1.89.

Question 3

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

Accepted Answer

D

Question 4

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

Accepted Answer

The answer of What does this graph tell you about...

Question 5

What conclusion can be drawn from the boxplot below? 
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.

Accepted Answer

The boxplot shows the distribution of birthweights for infants with SIRDS who either survived or died. The median birthweight of survivors is higher than that of the non-survivors, suggesting that birthweight is related to survival in cases of SIRDS. The boxplot does not provide information about the number of deaths or survivors, so option A and C are not supported by the data.

Question 6

What type of graph is shown below? 
A) Frequency polygon
B) Stacked histogram
C) Simple histogram
D) Frequency distribution

Accepted Answer

The graph shown is a simple histogram, which displays the frequency distribution of a single variable.

Question 7

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

Accepted Answer

The answer of What statement best describes what is shown...

Question 8

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

Accepted Answer

Identifying actual days of the week would provide more context and clarity about when the visitors were coming.

Question 9

Which of the following is not recommended when displaying information graphically?
A) Minimum use of ink
B) Use of 3-D effects
C) Informative labelling of each axis
D) Minimizing the number of distractions

Accepted Answer

The answer of Which of the following is not recommended...

Question 10

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)
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.

Accepted Answer

The boxplot shows that the median birthweight for infants who survived SIRDS is higher than those who died. This means that the median birthweight is lower for those who died. Therefore, choice A is the correct answer. The boxplot does not provide information on the mean birthweights, so B and D are not correct. Additionally, the boxplot shows that there is overlap in the interquartile ranges for both groups, so it cannot be determined if the median birthweight is greater for those who survived (C).

Question 11

Which of the following does a box-whisker plot not display
A) The range
B) The interquartile range
C) The lower quartile
D) The mean

Accepted Answer

A box-whisker plot does not display the mean, only the median.

Question 12

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

Accepted Answer

A scatterplot is used to show the relationship between two continuous variables. However, in the case of the number of people attending a nursing home on a Saturday, this is not a continuous variable but rather a discrete variable. A bar graph or a pie chart would be more appropriate to display this data. For the other options, a scatterplot would be an appropriate choice to display the relationship between the variables.

Quiz 5: Exploring Data With Graphs

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

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

What conclusion can be drawn from the boxplot below?

What type of graph is shown below?

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

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

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

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)

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

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