Question

Television has been known to have an effect on the popularity of things. For example, popular shows about lawyers have preceded increased applications to law school, and the latest boom in shows about criminal profiling has increased students' interest in forensic psychology. A student double-majoring in psychology and marketing was interested in whether the popularity of a song could be affected by its appearance on a popular television show about a high school singing group. He tracks the sales of music before and after the music is performed on the show. Hypothetical data (in millions) are provided in the table.

Sales: Before and After

Sales Before TV Appearance.	Sales after the song was covered on TV
1.3	1.7
0.9	1.4
2.1	1.2
1.6	1.8

a.) Compute the paired-samples t test and make a decision about a two-tailed hypothesis with a p level of 0.05

b.) Compute a 95 percent confidence interval

c.) Compute Cohen's d as a measure of effect size and interpret its meaning

Answer 1

Since confidence interval cotains zero hence fail to reject the null hypothesis