Question 1

Which of the following best describes a 'variable' in the context of statistics?

Accepted Answer

A property that can take different values for different individuals in a dataset.

Question 2

Which of the following is a quantitative variable?

Accepted Answer

Blood pressure (in mm Hg)

Question 3

A researcher records the color of flowers in a field as 'red', 'yellow', or 'white'. What type of variable is this?

Accepted Answer

Categorical

Question 4

Which type of graph is most appropriate for displaying the distribution of a single categorical variable?

Accepted Answer

Bar graph

Question 5

A pie chart is best used to:

Accepted Answer

Show how one categorical variable breaks down into its components as parts of a whole.

Question 6

Which of the following is NOT a correct use of a histogram?

Accepted Answer

Displaying the distribution of a categorical variable.

Question 7

A time plot is most useful for:

Accepted Answer

Displaying how a variable changes over time.

Question 8

Which of the following best describes a symmetric distribution?

Accepted Answer

The left and right halves of the histogram are mirror images of each other.

Question 9

In a right-skewed distribution, which of the following is true?

Accepted Answer

The right side (with higher values) extends much farther out than the left.

Question 10

Which of the following is a key step in constructing a histogram?

Accepted Answer

Divide the range of the quantitative variable into equal-size intervals called classes.

Question 11

A researcher collects the following data: Patient ID, diagnosis (heart disease, stroke, etc.), and age at death. Which variable is quantitative?

Accepted Answer

Age at death

Question 12

Which of the following is a potential problem when choosing the number of classes for a histogram?

Accepted Answer

Too many classes can result in a graph that is too detailed and no longer a summary.

Question 13

Which of the following is an example of an outlier in a dataset?

Accepted Answer

A value that falls far outside the overall pattern of the distribution.

Question 14

A dotplot is most useful for which type of dataset?

Accepted Answer

A small dataset of quantitative values.

Question 15

Suppose you are given the following data: the number of metastases detected in each mouse in a cancer study. Which type of graph would best display the distribution of this quantitative variable?

Accepted Answer

Histogram

Question 16

Which of the following statements about bar graphs and histograms is correct?

Accepted Answer

Bar graphs are used for categorical data, while histograms are used for quantitative data.

Question 17

A time plot of monthly atmospheric $$\mathrm{CO}_2$$ levels at Mauna Loa Observatory from 1958 to 2014 would best help you identify:

Accepted Answer

Trends and cyclical variations in $$\mathrm{CO}_2$$ over time.

Question 18

If a histogram of patient ages at diagnosis is bimodal, what does this suggest about the data?

Accepted Answer

There are two distinct groups of ages where cases are most common.

Question 19

Which of the following best describes the process of making a dotplot?

Accepted Answer

Place a dot above the value on a single axis for each data point, stacking dots for repeated values.

Question 20

A researcher wants to compare the number of mice exhibiting metastases in two treatment groups (IgG and anti-CD47). Which graph would be most appropriate?

Accepted Answer

Bar graph

Displaying Data with Graphs: Introduction to Statistical Data Types and Graphical Methods

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