The two intervals (114.9, 115.5) and (114.6, 115.8) are confidence intervals (computed using the same sample data) 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? (Hint: Where is the confidence interval centered?) Hz (b) The confidence level for one of these intervals is 90% and for the other it is 99%. Which one has a confidence level of 99%? O (114.9, 115.5) O (114.6, 115.8)

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