Learn Without Walls

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Module 2 Pre-Assessment

Before You Begin

This is a baseline assessment to see what you already know about descriptive statistics. Don't worry about your score – this isn't graded!

Why take this? At the end of Module 2, you'll retake the same assessment and see how much you've learned about summarizing data!

5 questions - Takes about 5 minutes
Not graded - Just for your learning
No pressure - It's okay to guess!
Immediate feedback - See explanations after you submit

Your responses help us understand how this course helps students learn. All data is anonymous and used only for research purposes.

1 What is the mean (average) of this dataset?
5, 8, 12, 15, 20

10
12
60
15

2 A dataset is already sorted: 2, 5, 7, 9, 11. What is the median?

5
7
6.8
9

3 Two classes both have an average test score of 75. Class A has a standard deviation of 15, while Class B has a standard deviation of 3. What does this tell you?

Class A students all scored exactly 75
Class A scores are more spread out than Class B scores
Class B performed better overall
Class A has more students than Class B

4 A distribution of household incomes has a mean of $80,000 and a median of $55,000. What does this suggest?

The distribution is symmetric
The distribution is right-skewed (a few very high incomes pull the mean up)
The distribution is left-skewed
Most people earn $80,000

5 You're analyzing home prices in a neighborhood where most homes cost $200,000-$300,000, but there are three mansions worth over $5 million. Which measure of center would BEST represent a "typical" home price?

Mean (average)
Median (middle value)
Mode (most common value)
All three measures would work equally well

You must answer all 5 questions before submitting

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