The two intervals (114.7, 115.7) and (114.4, 116.0) are confidence intervals (calculated using the same sample data) for u = true average resonance frequency (in hertz) for all tennis rackets of a certain type. (a) What is the value (in hertz) of the sample mean resonance frequency? (Hint: Where is the confidence interval centered?) hertz (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 (114.7, 115.7) O (114.4, 116.0) O It is impossible to tell which is which. How can you tell? O The 99% confidence interval should be narrower than the 90% confidence interval. O The center of the 99% confidence interval should be less than the center of the 90% confidence interval. O The center of the 99% confidence interval should be greater than the center of the 90% confidence interval. O The 99% confidence interval should be wider than the 90% confidence interval. O It is impossible to tell which is which.

Please answer the questions carefully to get the correct answers for the Bootstrap correlation.

Find the confidence interval for a Related-Samples t-test (Ch.11), given the following info: Level of confidence = 99% Before and After scores = see table below SSD (SS of the difference scores) = 2.75 Hint: as you’re doing calculations, don’t round any numbers in your calculations to less than two decimal places, or your final answer may be too rounded for you to be able to tell which answer below is correct.   Person Before X1 After X2 Difference (D = X2- X1) A 15 22 +7 B 18 23 +5 C 12 17 +5 D 17 23 +6 A. 1.90 < μD < 7.18 B. 2.53 < μD < 8.02 C. 2.95 < μD < 8.55 D. 2.01 < μD < 7.58