There is a large body of literature demonstrating that early exposure to frightening movies is associated with lingering fright symptoms. As part of a class on media effects study was performed in which participants were asked to write narrative accounts of their exposure to frightening movies before the age of 13. More than one-fourth of the respondents said that some of the fright symptoms were still present in waking life. Some of the

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There is a large body of literature demonstrating that early exposure to
frightening movies is associated with lingering fright symptoms. As part of
a class on media effects study was performed in which participants were
asked to write narrative accounts of their exposure to frightening movies
before the age of 13. More than one-fourth of the respondents said that
some of the fright symptoms were still present in waking life. Some of the
data is presented in the table:
Ongoing fright symptoms
No
Yes
Observed number of study participants
Group W
50
29
c.
d.
Group Q
31
7
a. Construct the joint distribution of the data, and the marginal
distributions.
b. Construct and describe the conditional distributions for the two
groups of participants.
Draw a bar plot of the distributions in (b).
Consider a test of association for the data in the table. State in a
few words what such a test is used for.
e.
Perform the test in (d). State the hypotheses, test statistic,
decision rule, and conclusion.
Transcribed Image Text:There is a large body of literature demonstrating that early exposure to frightening movies is associated with lingering fright symptoms. As part of a class on media effects study was performed in which participants were asked to write narrative accounts of their exposure to frightening movies before the age of 13. More than one-fourth of the respondents said that some of the fright symptoms were still present in waking life. Some of the data is presented in the table: Ongoing fright symptoms No Yes Observed number of study participants Group W 50 29 c. d. Group Q 31 7 a. Construct the joint distribution of the data, and the marginal distributions. b. Construct and describe the conditional distributions for the two groups of participants. Draw a bar plot of the distributions in (b). Consider a test of association for the data in the table. State in a few words what such a test is used for. e. Perform the test in (d). State the hypotheses, test statistic, decision rule, and conclusion.
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