По оценкам оператора сотовой связи средняя длительность
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- Tests
- Item:
- 4.docx (13.4 KB)
- Uploaded:
- 09.09.2013 12:57:56
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- tmc.do · about the seller and their products
DESCRIPTION
По оценкам оператора сотовой связи средняя длительность
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.
Additional information:
Solution of the problem
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