Question

story will Does being told how a suspenseful end ruin the experience for the reader? Movie and book critics are careful to avoid giving too much away in their reviews. But the impact of such "spoilers" has only recently been tested scientifically (Leavitt and Christenfeld 2011). Students were asked to read a variety of crime-mystery stories. Some were told the end- ing before starting to read whereas others were not told. At the end, readers were asked to rate their enjoyment of the stories on a scale from I to 10, with 10 indicating greatest enjoyment. The mean enjoyment score was 7.3 in the group of students told the endings beforehand, while average enjoyment score was 6.6 in the other group. A test of the statistical null hypothesis of no difference between the means of the two groups yielded P 0.001. a. State the appropriate conclusion of the test.: b. Do the data support the idea that knowing the 24. ending reduces the mean enjoyment of the stories? c. The authors used a two-sided test. Is this appropriate? Explain.

Answer 1

a) The P value is less than the significance level of the test, hence we have evidence that there is the difference between the mean.

b)No, the alternate hypothesis is $H_a:\mu_1-\mu _2 \neq 0$

this is a two tailed test

We have no evidence that knowing the ending reduces or increases the mean enjoyment of the stories.

c) Yes, as the question asked to test that if there is a difference between the two mean