Unit 2 · Topics 2.3 · 2.7 / Data interpretation

Read beyond the taller bar

Means, variation, and limits on inference.

About 10 minutes · Original short practice · Untimed

The stimulus / Keep it in view

Two recall groups

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

Study brief

In a fictional randomized design, two groups receive equal practice time and the same delayed recall test. Group R uses retrieval practice; Group S rereads. Each group has 40 participants. The table reports sample statistics. No p-value or inferential test is supplied.

Mean delayed-recall score

Delayed recall: correct answers out of 20
Group	Mean	Standard deviation
R · Retrieval	14	3
S · Rereading	11	2

Mark useful evidence, then explain what it helps you establish.

Start with the evidence.

Question 1 / 2

What does the mean difference indicate?Every R participant recalled three more items than every S participant.The R sample averaged three more correct answers than the S sample.R had three times as many participants.The result is certainly statistically significant.

Question 2 / 2

What does the larger standard deviation in R describe?A higher probability the result is trueA larger number of participantsA greater causal effectMore spread in R scores around their group mean

A short written explanation

Describe the difference between the means and the difference in variability. Explain one conclusion these descriptive statistics alone cannot establish.

Open a sentence starting point

Group R averaged ___, compared with ___. Its standard deviation indicates ___. The table alone does not establish ___.

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

Read beyond the taller bar · Student practice record

Read beyond the taller bar · AP Psychology

Unit 2 · Topics 2.3, 2.7 · In progress

Mode: guided. Hints opened: 0.

Study brief
In a fictional randomized design, two groups receive equal practice time and the same delayed recall test. Group R uses retrieval practice; Group S rereads. Each group has 40 participants. The table reports sample statistics. No p-value or inferential test is supplied.

Delayed recall: correct answers out of 20
Group | Mean | Standard deviation
R · Retrieval | 14 | 3
S · Rereading | 11 | 2

Evidence marked: None

Question 1: What does the mean difference indicate?
First checked response: Not checked

Question 2: What does the larger standard deviation in R describe?
First checked response: Not checked

WRITING PROMPT
Describe the difference between the means and the difference in variability. Explain one conclusion these descriptive statistics alone cannot establish.

FIRST DRAFT
Not written

REVISED RESPONSE
Not written

REVISION NOTE
Not written

SELF-REVIEW
State the three-item mean difference in context.: Not reviewed
Interpret the larger standard deviation as greater spread.: Not reviewed
Avoid universal individual or significance claims.: Not reviewed

TRANSFER
Two new groups both average 12, but their SDs are 1 and 5. Which interpretation fits?
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.