Miles./is./studying./visual./memory./function../He./has./recruited./research./parti
cipants./from./introductory./psychology./students../He./shows./a./randomly./sel
ected./one-
third./of./the./participants./emotionally./upsetting./photos,./shows./another./one
-third./very./happy./photos,./and./shows./the./last./one-
third./neutral./photos../He./then./tests./visual./memory./and./compares./the./score
s./of./the./groups../What./design./is./Miles./using?./-./correct./answer./between-
subjects
Miles./is./studying./visual./memory./function./in./a./clinical./setting../He./recruits
./individuals./in./the./early./stages./of./dementia,./administers./a./test./of./visual./m
emory,./and./then./tests./them./again./after./they./have./been./on./a./medication./th
at./may./slow./the./progress./of./dementia./for./a./month../This./is./a./---./design../-
./correct./answer./within./subject
Another./term./for./the./between-subjects./design./is./----./design../-
./correct./answer./independent./measures
What./is./the./primary./disadvantage./of./the./between-subjects./design?./-
./correct./answer./Vulnerability./to./individual./differences
, Rudy./is./diligent./in./ensuring./randomization./of./the./participants./in./his./stud
y./on./the./effects./of./expectations./on./alcohol-
related./impairments../However,./he./subsequently./finds./that./the./participant
s./in./one./of./his./groups./have./substantially./greater./experience./with./alcohol./t
han./do./those./in./the./other./group../This./difference./is./evidence./of:./-
./correct./answer./assignment./bias
Variables./such./as./the./rooms./in./which./an./experiment./is./conducted,./the./oc
currence./of./nearby./construction,./and./the./time./of./day./during./which./experi
ments./take./place./can./all./contribute./to:./-
./correct./answer./environmental./confounding
In./---
./,./the./group./assignment./process./is./limited./to./ensure./predetermined./charac
teristics./for./the./separate./groups../-
./correct./answer./restricted./random./assignment
Which./method./involves./assigning./individuals./to./groups./so./that./a./specific.
/variable./is./balanced./across./the./groups?./-
./correct./answer./ matched./assignment
Dominick./is./conducting./a./study./on./attitudes./toward./weight-
loss./methods../Because./he./believes./that./these./attitudes./may./be./related./to./
weight,./he./decides./to./include./only./individuals./whose./body./mass./indices./a
re./25.0./or./higher../What./method./is./Dominick./using?./-
./correct./answer./restricted./range