Referenced from lesson Threats to Validity (Spring, 2021)
Every claim below is wrong! Your job is to figure out why by looking at the data.
| Data | Claim | What’s Wrong | |
|---|---|---|---|
1 |
The average player on a basketball team is 6′1″. |
“Most of the players are taller than 6′.” |
|
2 |
Linear regression found a positive correlation (r=0.42) between people’s height and salary. |
“Taller people are more qualified for their jobs.” |
|
3 |
“According to the predictor function indicated here, the value on the x-axis is will predict the value on the y-axis 63.6% of the time.” |
||
4 |
Bar Chart of Pet Ages
|
“According to this bar chart, Felix makes up a little more than 15% of the total ages of all the animals in the dataset.” |
|
5 |
“According to this histogram, most animals weigh between 40 and 60 pounds.” |
||
6 |
Linear regression found a negative correlation (r= -0.91) between the number of hairs on a person’s head and their likelihood of owning a wig. |
“Owning wigs causes people to go bald.” |
These materials were developed partly through support of the National Science Foundation,
(awards 1042210, 1535276, 1648684, and 1738598). 
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