6.1.23 Construct the confidence interval for the population mean u. c= 0.95, x = 16.6, o = 9.0, and n= 65 A 95% confidence interval for u is (Round to one decimal place as needed.) sts

Given the data below: x̄ = 140, σ = 20, n = 12 A 95% confidence interval would be 140 ± _______(round your answer to two spaces past the decimal).

The two intervals (114.9, 115.7) and (114.6, 116.0) are confidence intervals (calculated using the same sample data) for ? = 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%?   (114.9, 115.7) (114.6, 116.0)     It is impossible to tell which is which.   How can you tell? The 99% confidence interval should be wider than the 90% confidence interval.   The center of the 99% confidence interval should be greater than the center of the 90% confidence interval.       The 99% confidence interval should be narrower than the 90% confidence interval.   The center of the 99% confidence interval should be less than the center of the 90% confidence interval.   It is impossible to tell which…

Chapter 8 Confidence Intervals (Mean) Progress saved Done Score: 0/14 0/14 answered Question 4 Assume that a sample is used to estimate a population mean l. Find the 80% confidence interval for a sample of size 37 with a mean of 34.5 and a standard deviation of 14.6. Enter your answer as an open- interval (i.e., parentheses) accurate to 3 decimal places. 80% C.I. D Answer should be obtained without any preliminary rounding. Question Help: Message instructor Submit Question ishelf arch Rain..^EO