Each of the following is a confidence interval for mu = true average (i.e., popu

Question

Each of the following is a confidence interval for mu = true average (i.e., population mean) resonance frequency (Hz) for all tennis rackets of a certain type: (118.6, 119.4) (118.4, 119.6) What is the value of the sample mean resonance frequency? __________ Hz Both intervals were calculated from the same sample data. The confidence level for one of these intervals is 90% and for the other is 99%. Which of the intervals has the 90% confidence level, and why? The second interval has the 90% confidence level because t is a narrower interval. The second interval has the 90 % confidence level because it is a wider interval. The first interval has the 90% confidence level because it is a narrower interval. The first interval has the 90% confidence level because it is a wider interval.

Explanation / Answer

a )sample mean=(119.4+118.6)/2 =(119.6+118.4)/2=119

b)the first interval has the 90% confidence interval , beause it has narrower interval

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