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Free Practice Quiz Question List

1 Descriptive Statistics and Data Visualization Online Quiz Questions

Use this free practice quiz with 20 questions to review 1 Descriptive Statistics and Data Visualization, test your knowledge, and prepare for your next test or exam.

20 questions
01
Choose one
1 point

A sales dataset contains one record per order and fields for sales channel, order value, and delivery time. Which layout follows the recommended structure?

  1. A

    Use one row per order and one column per variable.

  2. B

    Use one row per variable and one column per order.

  3. C

    Put all variables for each order into a single column, with no separate fields.

  4. D

    Use one row per value and a column that lists the orders.

02
Choose one
1 point

A retailer wants to compare the number of orders from its online, store, and phone channels. Which graph is most appropriate?

  1. A

    A histogram

  2. B

    A bar chart

  3. C

    A line chart

  4. D

    A scatterplot

03
Written response
1 point

Which graph type is most suitable for showing monthly delivery volume changing over time?

04
Fill in the blank
1 point

The range is the maximum value minus the .

05
Written response
1 point

A store records 12 online orders out of 20 total orders. What percentage of the orders were online? Enter the percentage value.

06
True or false
1 point

In a histogram, the bars touch because the bins represent intervals along a continuous numerical scale.

  1. A

    True

  2. B

    False

07
Choose all
1 point

Before calculating summaries for a dataset, which checks can help identify data-quality problems? Select all that apply.

  1. A

    Check for duplicate records.

  2. B

    Check for inconsistent categories or units.

  3. C

    Replace every missing value with zero.

  4. D

    Check for implausible entries.

08
Fill in the blank
1 point

Compared with the mean, the median is less affected by .

09
Choose one
1 point

A delivery-time distribution is strongly skewed and includes an unusually long delivery. Which pair of summaries is most appropriate for describing its center and middle-half spread?

  1. A

    Mean and range

  2. B

    Mean and standard deviation

  3. C

    Median and interquartile range

  4. D

    Mode and range

10
True or false
1 point

When calculating a sample standard deviation, the sum of squared deviations from the sample mean is divided by the sample size minus one before taking the square root.

  1. A

    True

  2. B

    False

11
Choose one
1 point

A graph compares delivery times for two shipping methods. Which design choice is most likely to exaggerate the apparent difference between the groups?

  1. A

    Adding units to the vertical-axis label

  2. B

    Starting the vertical axis at a value well above zero so small differences look large

  3. C

    Using the same scale for groups being compared

  4. D

    Giving the graph a useful title

12
Choose all
1 point

A report uses graphs to compare results across groups. Which practices support clear and fair interpretation? Select all that apply.

  1. A

    Label the axes and identify the groups being compared.

  2. B

    Use consistent scales when comparing groups.

  3. C

    Use uneven intervals on an axis to fit more values.

  4. D

    Select only time periods that make the difference between groups look largest.

  5. E

    Give the graph a useful title.

13
Open ended
1 point

A manager reports the median delivery time for a batch of orders but gives no further context. What information should be added to make the summary interpretable, and what can the median alone not establish about causes or future orders?

14
Choose one
1 point

In a dataset of product colors, blue and green are tied as the most frequent categories. Which statement about the mode is correct?

  1. A

    It has no mode because the most frequent categories must be unique.

  2. B

    It has exactly one mode, selected arbitrarily from the tied categories.

  3. C

    It can have more than one mode.

  4. D

    Its mode must equal its median.

15
Choose one
1 point

A store is organizing a dataset of customer orders. Which layout follows the usual structure for a dataset?

  1. A

    Each row represents one order, and each column represents a variable recorded about that order.

  2. B

    Each row represents one variable, and each column represents an order.

  3. C

    Each row represents a category total, and each column represents a different graph.

16
True or false
1 point

True or false: If a delivery-time entry is blank, it should be treated as a delivery that took zero days.

  1. A

    True

  2. B

    False

17
Choose one
1 point

A retailer wants to show how its monthly sales changed throughout the year. Which display is most suitable, and how should the months be arranged?

  1. A

    A scatterplot, with the months arranged by sales value on the horizontal axis.

  2. B

    A line chart, with the months in chronological order on the horizontal axis.

  3. C

    A histogram, with each month treated as a numerical interval.

18
Choose one
1 point

An analyst wants to display the distribution of customers’ waiting times by grouping the quantitative values into intervals. Which graph is appropriate, and how should its bars appear?

  1. A

    Use a histogram with touching bars for the quantitative intervals.

  2. B

    Use a bar chart with separated bars for the quantitative intervals.

  3. C

    Use a line chart with one point for each interval and no horizontal scale.

19
Written response
1 point

A sales channel accounts for 5 of 20 orders. What percentage of the orders used that channel? Enter the numeric percentage only, as percentage points.

20
Written response
1 point

Five orders took 2, 3, 3, 4, and 8 days to deliver. What was their mean delivery time? Enter the value in days.