Iowa State researchers conducted a designed experiment in which 324 adults were
ID: 3174921 • Letter: I
Question
Iowa State researchers conducted a designed experiment in which 324 adults were randomly assigned to one of three viewer groups of 108 participants each (Journal of Applied Psychology). One group watched a TV program with a violent content code, the second group viewed a show with a sex content code rating, and the last group watched a neutral TV program. Nine commercials were embedded into each TV Show. After viewing the program, each participant was scored on his or her recall of the brand names in the commercial messages, with scores ranging from 0 (no brands) to 9 (all brands). Treatment populations are assumed to be approximately normal. Using data simulated from information in the article, a test for equality of means between viewing groups was conducted at = 0.05 resulting in the conclusion that at least one mean is different.
Use the SAS output below to rank the means.
i.µN > µV = µs
ii.µN > (µV and µs)
iii.µN > µV > µs
Means with the same letter are not significantly different.
Bon Grouping
Mean
N
RATING
A
3.166
108
N
B
2.083
108
V
B
B
1.713
108
S
Means with the same letter are not significantly different.
Bon Grouping
Mean
N
RATING
A
3.166
108
N
B
2.083
108
V
B
B
1.713
108
S
Explanation / Answer
This is merely about interpreting the mean values in the table
Means with the same letter are not significantly different.
Bon Grouping
Mean
N
RATING
A
3.166
108
N
B
2.083
108
V
B
B
1.713
108
S
here meanN = 31.66 , meanV= 2.083 and meanS = 1.713
hence the correct answer is C meanN > meanV > meanS
Means with the same letter are not significantly different.
Bon Grouping
Mean
N
RATING
A
3.166
108
N
B
2.083
108
V
B
B
1.713
108
S
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