Here are the names of 12 orchestra conductors and their performance times in minutes for Beethoven’s Ninth Symphony:

a. Check to see that normality is a reasonable assumption for the performance time distribution.
b. Compute a 95% CI for the population standard deviation, and interpret the interval.
c. Supposedly, classical music is 100% determined by the composer’s notation, including all timings. Based on your results, is this true or false?

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Bernstein Leinsdorf Solti Bohm Masur Steinberg 71.03 65.78 74.70 72.68 69.45 68.62 Furtwängler Ormandy Szell Karajan Rattle Tennstedt 74.38 64.72 66.22 66.90 69.93 68.40