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По оценкам оператора сотовой связи средняя длительность
Sold: 12
Refunds: 0
Uploaded: 09.09.2013
Content: 4.docx 13,4 kB
Refunds: 0
Uploaded: 09.09.2013
Content: 4.docx 13,4 kB
Product description
According to the mobile operator the average duration of daily calls of 24 minutes per user. A sample survey of 100 customers showed that the average daily duration of the call is 30 minutes. At the level of α = 0,05 vote statistically significant difference sample survey, it is known that the standard deviation of duration of calls in the general population is 3 minutes.
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