Question 1

A histogram is most closely related to which of the following graphs?

Accepted Answer

A)   Stem-and-leaf plot
B)   Scatterplot
C)   Pie chart
D)   Radar plot A

Question 2

Inspect the post-test box-whisker plot. Which of the following quartiles has the greatest range of data?

Accepted Answer

A)   0-25%
B)   26-50%
C)   51-75%
D)   76-100% A

Question 3

Twenty-five percentile points is commonly referred to as a

Accepted Answer

A)   Quartile
B)   Interquartile range
C)   Quarter
D)   Range A

Question 4

Researchers were interested in finding out how the respiratory parameters in a group of individuals who were diagnosed with asthma responded to a six-week aerobic training intervention. Forced expired ratio (FER, %) is the product of the forced expired ratio in 1 second (FEV1, litres) divided by the forced vital capacity (FVC, litres) and was the parameter the researchers were most interested in. The results are presented below. Enter the data into SPSS and plot a bar chart representing the mean of the pre- and post-test data. Add the 95% confidence intervals for the mean. You should get the bar chart shown below. What does the 95% confidence interval (CI) that you have plotted refer to?

Accepted Answer

A)   95% confidence that the mean will fall between these intervals
B)   95% confidence that all data points fall between these intervals
C)   95% confidence that all data points fall outside these intervals
D)   95% confidence that the range falls between these intervals

Question 5

Describe the appearance of the line of best fit plotted with the FER data.

Accepted Answer

A)   Positive
B)   Negative
C)   Positively negative
D)   Negatively positive

Question 6

Analyse the following box-whisker plot. What assumptions can be made about participant 3 in the post-test data set?

Accepted Answer

A)   This person has the lowest score and can be considered an outlying data point
B)   This person has the lowest score and can be considered an extreme outlying data point
C)   This person has the lowest score but is not considered an outlying data point
D)   This person has the lowest score but is a borderline outlying data point

Question 7

Which measure of central tendency is presented in a box-whisker plot?

Accepted Answer

A)   Median
B)   Mean
C)   Mode
D)   Standard error of the mean

Question 8

Which axis is the dependent variable usually plotted on?

Accepted Answer

A)   x-axis
B)   y-axis
C)   z-axis
D)   a-axis

Question 9

Calculate the mean and standard deviation of the pre-test FER scores.

Accepted Answer

A)   68.5 ± 17.0%
B)   65.8 ± 18.1%
C)   70.4 ± 15.0%
D)   66.6 ± 17.8%

Question 10

Which of the following is a type of histogram?

Accepted Answer

A)   Stacked histogram
B)   Frequency polygon
C)   Population pyramid
D)   All of the above

Question 11

Why is it necessary to present numerical data graphically?

Accepted Answer

A)   To explore the data.
B)   To enable you to 'make sense' of the data.
C)   To gain a greater insight into the data.
D)   All of the above.

Question 12

Calculate the mean and standard deviation of the post-test FER scores.

Accepted Answer

A)   72.6 ± 16.6%
B)   69.8 ± 19.7%
C)   70.9 ± 19.4%
D)   66.6 ± 17.3%

Question 13

Normally distributed data are normally referred to as

Accepted Answer

A)   Bell-shaped
B)   Asymmetrical
C)   Skewed
D)   Peaked

Question 14

Which of the following are important components of graphical illustrations?

Accepted Answer

A)   Labelled axes
B)   Clarity and conciseness
C)   A legend if appropriate
D)   All of the above

Question 15

The interquartile range represents how many percentiles?

Accepted Answer

A)   25%
B)   10%
C)   50%
D)   75%

Question 16

Plot the FEV1 data presented in Q11 as a scatterplot. You should get the scatterplot shown below. Inspecting the scatterplot, what is the r-value for the line of best fit?

Accepted Answer

A)   .96
B)   .94
C)   .93
D)   .92

Question 17

If you were to graphically present the learning style data, which might be the most appropriate option?

Accepted Answer

A)   Bar chart
B)   Scatterplot
C)   Histogram
D)   Stem-and-leaf plot

Question 18

A researcher randomized 75 children into three groups (25 per group). Each group was taught how to perform a basketball free throw using either a visual, aural or verbal learning style. The success of the learning style was determined by the number of points scored from ten attempts. Which of the following would be considered the independent variable?

Accepted Answer

A)   Number of successful free throw attempts
B)   Learning style of group
C)   Number of unsuccessful free throw attempts
D)   Both successful and unsuccessful free throw attempts

Question 19

The graph presented below represents the post-test FER data, but what is its correct title?

Accepted Answer

A)   Stem-and-leaf plot
B)   Histogram
C)   Line plot
D)   Error bar plot

Question 20

Which measure of data distribution is presented as the 'box' in a box-whisker plot?

Accepted Answer

A)   Interquartile range
B)   Standard deviation
C)   Standard rrror of the mean
D)   Range

Exam 5: Exploring Data With Graphs