The call durations. in seconds, for a random sample of eleven customers who telephoned a bank's customer Hot Line are: 20 101 21 169 62 120 22 122 156 103 132 m Obtain a point estimate, to two decimal places, ofthe mean duration of all calls tothe Hot Line. Give your answerto two decimal places in the form \"xxx Data can be copied and pasted into Exceito complete the calculations Answer: Part B lfthe population standard deviation of call durations is assumed to be 'I? seconds. and the length of calls is assumed to be normallvdistributed. obtain a 95% condence interval for the mean duration of calls to the hotline. What is the upper limit of the condence interval? Give your answer to one decimal place in the form xxx.x Answer: Part 0 True or false: a 99% condence interval based on the same sample would be narrower. Answer by placing T or F in the space provided