Module 2 Quiz

Test Your Descriptive Statistics Knowledge!

This quiz covers all topics from Module 2: Measures of Center, Measures of Spread, Distribution Shapes, and Boxplots. Pass with 70% (11/15 correct) to earn your Module 2 completion badge!

Quiz Rules

15 questions - Multiple choice
Passing score: 70% (11 out of 15 correct)
No time limit - Take your time and think carefully!
One attempt shown - But you can retake as many times as needed
Instant feedback - See explanations after submitting

1 What is the mean of this dataset: 10, 15, 20, 25, 30?

2 A dataset of home prices has Mean = $450,000 and Median = $320,000. Which measure better represents a "typical" home price?

Mean, because it uses all data values
Median, because it's resistant to high-priced outliers
Mode, because it shows the most common price
Both mean and median are equally good

3 Find the median of this ordered dataset: 5, 8, 12, 15, 18, 20

12
13
13.5
15

4 Which measure of center can be used for categorical data (like favorite colors)?

Mean
Median
Mode
All three can be used

5 Calculate the range: 22, 28, 35, 40, 52

6 A dataset has Q1 = 30 and Q3 = 50. What is the IQR?

7 If a dataset has variance = 36, what is the standard deviation?

6
18
36
1296

8 Heights are bell-shaped with mean = 68 inches and SD = 4 inches. Using the Empirical Rule, what percentage of heights fall between 64 and 72 inches?

50%
68%
95%
99.7%

9 A distribution has Mean = 60, Median = 70, Mode = 75. What is the shape?

Symmetric
Right-skewed
Left-skewed
Cannot determine from this information

10 Which real-world dataset would most likely be right-skewed?

Heights of adult women
Household income
IQ scores (designed to be symmetric)
Scores on an easy test

11 In a symmetric distribution, where is the mean located relative to the median?

Approximately equal to the median
Always greater than the median
Always less than the median
No consistent relationship

12 When would you use the median instead of the mean to summarize a dataset?

When the data is symmetric
When the data is skewed or has outliers
Never—the mean is always better
Only when you have fewer than 10 data points

13 What percentage of data falls between Q1 and Q3 in a boxplot?

25%
50%
75%
100%

14 Using the 1.5×IQR rule, what is the upper fence for outlier detection if Q1 = 20 and Q3 = 40?

15 In a boxplot, if the median line is much closer to Q3 than to Q1, what does this indicate?

Symmetric distribution
Right-skewed distribution
Left-skewed distribution
There's an error in the data

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