The two intervals (114.4, 115.6) and (114.1, 115.9) are confidence intervals for μ = true average resonance frequency (in hertz) for all tennis rackets of a certain type.
A. What is the value of the sample mean resonance frequency?
B. The confidence level for one of these intervals is 90% and for the other it is 99%. Which is which, and how can you tell?