2. Each of the following is a large-sample confidence interval for μ, the mean resonance frequency (HZ) for all tennis rackets of a certain type. (114.4, 115.6), (114.1, 115.9)
a. What is the value of the sample mean resonance frequency?
b. Both intervals were calculated from the same data. The confidence level of one of these intervals is 90% and the other is 99%. Which of these intervals has the 99% confidence level, and why?