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

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

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?