Researchers compare the mean commercial recall scores of viewers of three TV pro
ID: 3043044 • Letter: R
Question
Researchers compare the mean commercial recall scores of viewers of three TV programs, one with a violent content code (v) rating, one with a sex content code (s) rating, and one is a neutral TV program. The researchers conducted multiple comparisons of the three mean recall scores using Tukey's method. Complete parts a through d.
Comparison Tukey Confidence Interval
s-v (-1.154, 3.667)
n-v (0.007, 2.258)
n-s (0.103, 1.855)
a. How many pairwise comparisons are made in this study?
b. Determine the correct interpretation of the confidence interval for the comparison of the s and v groups.
There is
evidence
no evidence
to indicate a difference in the mean recall scores between the sexual and violent content programs because 0
in this interval.
c.
Determine the correct interpretation of the confidence interval for the comparison of the n and v groups.
There is
no evidence
evidence
to indicate a difference in the mean recall scores between the neutral and violent content programs because 0
is not
is
in this interval.
Determine the correct interpretation of the confidence interval for the comparison of the n and s groups.
There is
evidence
no evidence
to indicate a difference in the mean recall scores between the neutral and sexual content programs because 0
is not
is
in this interval.
Determine which of the groups has the largest mean recall score.
A. Neutral content
B. Violent content
C. None of the groups have a significantly larger mean recall score.
D. Sexual content
d. The researchers conclude that "memory for [television] commercials is impaired after watching violent or sexual programming." Do you agree?
No
Yes
, because the mean recall score for those watching the neutral program was
not significantly different from
significantly smaller than
significantly larger than
the mean recall scores of the other two groups.
Explanation / Answer
Comparison Tukey Confidence Interval
s-v (-1.154, 3.667)
n-v (0.007, 2.258)
n-s (0.103, 1.855)
a) How many pairwise comparisons are made in this study:
Three pairwise comparisons of S,N and V
b) The correct interpretation of the confidence interval for the comparison of the s and v:
On pairwise comparisons, if the mean differences having zero within interval range we can conclude that there is both means are statistically equal.
S-V and mean difference : (-1.154, 3.667).
There is no enough evidence to indicate a difference in the mean recall scores between the sexual and violent content programs because of 0 in this interval.
c)
The correct interpretation of the confidence interval for the comparison of the n and v groups.
Interval range: (0.007, 2.258)
There is evidence to indicate a difference in the mean recall scores between the neutral and violent content programs because of 0 not in the interval.
The correct interpretation of the confidence interval for the comparison of the n and s groups.
Interval range: (0.103, 1.855)
There is evidence to indicate a difference in the mean recall scores between the neutral and sexual content programs because of 0 not in the interval.
d) "memory for [television] commercials is impaired after watching violent or sexual programming." Do you agree?
Yes, they both have an insignificant mean difference.
Because the mean recall score for those watching the neutral program was
Significantly larger than the mean recall scores of the other two groups. Here, the pairmean difference with N-S and N-V is higher than zero. So. Neutral is higher than other two groups.
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