Iowa State researchers conducted a designed experiment in which 324 adults were

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.

a) State the hypotheses to determine if at least one of the treatment group means is different.

b) is this a balanced design? yes or no

c) Assumptions are met to draw valid inferences from an ANOVA. Is there a difference in means between viewing groups? = 0.05

i. yes. at least one mean is different

ii. yes. all of the means are different.

iii. no enough evidence .

iv. no. all mean are the same

d) which viewing group mean can we infer is the largets in the population?

i) sexual content , ii) violent content , iii)neutal content , iv) cannot determine with output given

Analysis Variable: Recall recall Rating N Obs N Mean Std Dev Min Max N 108 108 1.712 1.81111 0 7 S 108 108 2.083 1.6635 0 7 V 108 108 1.7300 0 7

Explanation / Answer

a) H0: There is no significance difference between three groups

H1: Atleast one group is different

b) Yes it is balanced since all the sample sizes are equal

c) F cal =20.45

Since P<0.05, we reject the H0. Hence claim is significant ie., Atleast one group mean is different.

d) cannot determine with output

Since Violent content mean is missing

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