Unit 5 · Topics 5.1 / Data interpretation

Correlation with a direction

Interpret r without turning it into a percentage.

About 10 minutes · Original short practice · Untimed

Start with the evidence.

Question 1 / 2

What does the sign of r indicate?Higher stress tends to accompany fewer reported sleep hours.Exactly half of participants slept poorly.Stress caused fifty percent of lost sleep.There is no relationship.

Question 2 / 2

Which is the strongest linear association by magnitude?r = +.10r = −.20r = +.40r = −.65

A short written explanation

Interpret r = −.50 in context and explain why it does not mean stress caused fifty percent of sleep loss.

Open a sentence starting point

The negative correlation means ___. The coefficient is not ___ because the design ___.

0 words · Write at least 12 before opening the revision guide. Written reasoning is reviewed by a teacher.

Correlation with a direction · Student practice record

Correlation with a direction · AP Psychology

Unit 5 · Topics 5.1 · In progress

Mode: guided. Hints opened: 0.

Study brief
A fictional survey of 150 adult volunteers finds r = −.50 between weekly stress ratings and reported nightly sleep hours. Higher values on the stress scale mean more stress. Both variables are self-reported; neither is manipulated. No significance test is provided.

Evidence marked: None

Question 1: What does the sign of r indicate?
First checked response: Not checked

Question 2: Which is the strongest linear association by magnitude?
First checked response: Not checked

WRITING PROMPT
Interpret r = −.50 in context and explain why it does not mean stress caused fifty percent of sleep loss.

FIRST DRAFT
Not written

REVISED RESPONSE
Not written

REVISION NOTE
Not written

SELF-REVIEW
Name both measured variables and the negative direction.: Not reviewed
Reject the causal-percentage interpretation.: Not reviewed
Identify a design or measurement limit.: Not reviewed

TRANSFER
A new dataset has r = 0. Which statement is safest?
Not checked

Choice checks: 0/2. Transfer: Not checked. Written work requires teacher review; these are not AP points.

Original fictional teaching study. These are invented observations, not published research findings.