Name: Ann-Koraly Jean-Bart
Homework #3: ANOVA and Post-Hoc LSD (worth 35 points)
Instructions: Read the scenario and answer the questions. Print out one copy to turn in and print
another copy to check during class. In addition to this document, you should turn in:
All relevant SPSS outputs
Word document with write up
Figure (either from Excel or pasted into this Word document)
A researcher is interested in how long people can retain information in short term memory. He makes a
list of three-letter strings (for example "GSZ" is a letter string) with 50 items on it. He randomly assigns
40 participants into one of four memory conditions: 3 seconds, 5 seconds, 7 seconds and 9 seconds. In
the 3 second memory condition, participants try to recall the letter string 3 seconds after seeing it on a
screen; in the 5 second condition, they wait 5 seconds before recalling, and so forth. Participants were
told not to repeat the letters silently to themselves. The number of correctly recalled letter strings (out of
50) was recorded for each participant. The data can be found in the Excel file "Memory.xlsx".
1). Check assumptions in SPSS using histograms and box plots. Are any assumptions violated?