Every year favorite songs compete to be on a Top 200 list based upon sales and rankings by the experts in the music industry. These songs have many characteristics, such as song length and beats per minute, which vary from category to category in the music industry. A disc jockey wondered if the number of beats per minute in songs classified as dance music were lower than the beats per minute in the songs that are ranked on a Top 200 list from 2001. A random sample of songs from each group was selected and the beats per minute are listed in the chart at the right. Does this sample indicate that songs classified as dance music have lower beats per minute than the songs ranked on a Top 200 list?

Beats per minute:
dance songs: 121 122 117 120 120 121 118 120 117 119 121 122 119 119 118 120 123 118.
Top 200 songs: 122 121 121 122 121 119 120 119 120 118 121 123 118 120 124

8) Test an appropriate hypothesis and state your conclusion.
9) Create and interpret a 90% confidence interval.