Question 1

Which of the following statements best describes a stem-and-leaf plot?

Accepted Answer

It separates each number into a stem and a leaf, displays original data values, and provides an easy way to sort quantitative data.

Question 2

Given the following data set of text messages sent: 21, 25, 25, 26, 27, 28, 30, 36, 36, 45. What is the stem for the value 36 in a stem-and-leaf plot?

Accepted Answer

3

Question 3

A dot plot is most useful for which type of data?

Accepted Answer

Quantitative data with a small to moderate number of distinct values.

Question 4

In a pie chart, how do you calculate the central angle for a category with relative frequency $$f$$?

Accepted Answer

$$360^\circ 	imes f$$

Question 5

Which of the following is a key feature of a Pareto chart?

Accepted Answer

Bars are arranged in order of decreasing height from left to right.

Question 6

A scatter plot is used to:

Accepted Answer

Show the relationship between two quantitative variables.

Question 7

If a time series chart shows the number of burglaries remained the same until 2011 and then decreased through 2019, what does this indicate?

Accepted Answer

There was a stable period followed by a downward trend in burglaries.

Question 8

Which graph would be most appropriate to display the relationship between petal length and petal width in Fisher's Iris data set?

Accepted Answer

Scatter plot

Question 9

Suppose you have the following frequencies for causes of death in the US: Heart disease (659,041), Cancer (599,601), Accidents (173,040), Chronic lower respiratory disease (156,979), Stroke (150,005). Which cause should be placed at the leftmost position in a Pareto chart?

Accepted Answer

Heart disease

Question 10

Which of the following is a correct interpretation of a dot plot showing most entries between 20 and 80, with only a few above 100?

Accepted Answer

Most individuals sent between 20 and 80 text messages, and values above 100 are outliers.

Question 11

When constructing a stem-and-leaf plot with two rows per stem, what is the main advantage?

Accepted Answer

It provides a more detailed picture of the data distribution.

Question 12

Which type of graph is best for showing how a variable changes over regular intervals of time?

Accepted Answer

Time series chart

Question 13

If a pie chart shows that the central angle for a category is $$91.8^\circ$$, what is the relative frequency of that category?

Accepted Answer

$$0.255$$

Question 14

Which of the following is NOT a feature of a stem-and-leaf plot?

Accepted Answer

It is used to display paired data sets.

Question 15

A time series chart is constructed by plotting data points and connecting them with line segments. What does a steep downward segment indicate?

Accepted Answer

A rapid decrease in the variable over that time interval.

Question 16

Which graph would be most appropriate to display the percentage of different types of degrees conferred in a year?

Accepted Answer

Pie chart

Question 17

If a scatter plot of petal length and petal width shows that as petal length increases, petal width also increases, what type of relationship is this?

Accepted Answer

Positive correlation

Question 18

Which of the following is a correct step when constructing a stem-and-leaf plot for the data value 104?

Accepted Answer

Use 10 as the stem and 4 as the leaf.

Question 19

Which of the following graphs is best for comparing the frequencies of several categories, especially when you want to highlight the most frequent category?

Accepted Answer

Pareto chart

Descriptive Statistics: Graphical Representation of Data

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