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In an effort to investigate how 10 college students retain information from a novel, a teacher shows them a movie about the novel after they read the...

In an effort to investigate how 10 college students retain information from a novel, a teacher shows them a movie about the novel after they read the book.  A pre-test is given before the movie and a post-test is given after the movie.  The results are below.  a = 0.01.  Can the teacher conclude the movie helped to improve the student's retention of information?  Construct a 95% confidence interval for the mean difference in the number of points that changed between the pre-test and the post test after watching the movie.  Interpret the confidence interval.

 D = -4.5     SD= 4.79            n= 10

         


Top Answer

The 't' test statistic = D / [S D /√n]                                    = - 4.5/[4.79/√10]      ... View the full answer

5 comments
  • a small typo error. Modified T critical value is = 2.2621, So the correct 95% CL = [ -7.9265, 1.0735 ]
    • chinnaistats
    • Jul 19, 2016 at 6:32pm
  • should it be -7.9625, -10735
    • PresidentHackerGrouse5435
    • Jul 19, 2016 at 6:54pm
  • should it be -7.9625, -1.0735
    • PresidentHackerGrouse5435
    • Jul 19, 2016 at 6:57pm
  • upper limit is positive value
    • chinnaistats
    • Jul 19, 2016 at 6:59pm
  • -7.9265, 1.0735
    • chinnaistats
    • Jul 19, 2016 at 6:59pm

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