Question

The following data shows the average time span of international phone calls by a

sample of 15 executives of a company having operations overseas:  

Time   in (minutes)

12.0 15.0 16.3 13.2 12.6 18.2 8.7 13.5

16.9 11.3 15.4 16.2 12.6 10.5 9.6 6.0

An approximate 95% confidence interval for the average time span of calls is

(a) 11.244 to 14.756

(b) 12.344 to 15.856

(c) 10.564 to 14.876

(d) 12.831 to 16.667

(e) 13.453 to 15.887

Answer 1

According to sources, the most probable answer to this query are: "(b) 12.344 to 15.856"

1) The means for the given data = 13
2) The mean absolute deviation of the data = 2.58
3) The median is 12.9

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