Exercise 6.292 describes a study investigating whether giving away the ending of the story makes the story more or less enjoyable to read. The data are given in Table 6.28 and stored in StorySpoilers.
(a) Explain why it is appropriate and helpful to use the matched pairs nature of these data in the analysis.
(b) Find and interpret a 95% confidence interval for the difference in mean enjoyment rating between stories with a spoiler and stories without.

Table 6.28

Exercise 6.292

A story spoiler gives away the ending early. Does having a story spoiled in this way diminish suspense and hurt enjoyment? A study investigated this question. For 12 different short stories, the study€™s authors created a second version in which a spoiler paragraph at the beginning discussed the story and revealed the outcome. Each version of the 12 stories was read by at least 30 people and rated on a 1 to 10 scale to create an overall rating for the story, with higher ratings indicating greater enjoyment of the story. The ratings are given in Table 6.28 and stored in StorySpoilers. Stories 1 to 4 were ironic twist stories, stories 5 to 8 were mysteries, and stories 9 to 12 were literary stories. Test to see if there is a difference in mean overall enjoyment rating based on whether or not there is a spoiler.

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Story With spoiler 1 3 4 6. 10 11 12 4.6 4.7 5.1 7.9 7.4 7.0 7.1 7.2 7.1 7.2 4.8 5.2 6.7 Original 3.8 4.9 7.1 6.2 6.1 6.7 7.0 4.3 5.0 4.1 6.1