Задачи Статистика 11-12

Target 11.

To determine the average size of wages of workers of small enterprises is necessary to conduct a sample survey of randomly re-selection. How many employees need to select to sampling error probability 0.954 did not exceed 2 thousand. Rub. with an average deviation of 10 thousand. rub.

Zadacha12.

Data on the area under potatoes before and after the changes in the boundaries area, hectares:

periods

area

under potatoes 1 2 3 4 5 6 7

Before changing the borders of the area 110 115 112 ----- ----- ----- -----

After changing the boundaries of the area ----- ----- 208 221 229 234 230

Closed The number 204.2 213.5 320 221 229 234 230

Serried row, expressing the area under potatoes in a changing district boundaries.