Suppose that a customer service center claims that the telephone calls it recieves last 113 seconds on average, with a standard
deviation of 9 seconds. if you took a sample of 324 phone calls, which of the following mean times would be within the 95% confidence interval? A. 116.5 seconds
B. 114.5 seconds
C. 113.5 seconds
D. 115.5 seconds
The distribution lies within one of the standard of deviation of the mean so <span>68% </span> The distribution lies within two of the standard of deviations of the mean so 95% The distribution lies within three of the standard of deviations of the mean so 99.7%
