18. объем выборки равен 100, количество наблюдаемых признаков равно 5 , тогда число степеней свободы выборки равно а) 98 б) 95 в) 105 г) 90 д) 92
some time ago people used to travel on horseback but now they travel by car,train and bus
some time ago people used to wash thigs by hand but now they wath it in washing machine
some time ago people used to write letters but now they send e-mails
some time ago people used to write books by hand but now they print it
some time ago people used to read more books but now they watch a lot of tv
some time ago people used to have big families but now they have smaller one
some time ago people used to die early but now they live longer lives
some time ago people used to walk upstairs and downstairs but now they use lifts
some time ago people used to know not so much about our planet but now they know a lot
some time ago people used to dream about flying to the stars but now wishes come true
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