(1) Understand the service life of a batch of air conditioners;
(2) the number of typos in the manuscript reviewed by the publishing house;
(3) Investigate the national fitness in the whole province.
answer
(1) sampling survey (2) general survey (3) sampling survey
In order to know the daily consumption of his family, Xiao Liang recorded the daily consumption expenditure of his family for seven weeks in a year. The data are as follows (unit: yuan):
230 l95 180 250 270 455 170
Please estimate the total daily consumption expenditure of families in Liang Xiao every year (52 weeks per year).
answer
13000 yuan
In order to find out the time for students in Grade One 100 to finish their homework every day, a proofreader 100 students conducted a spot check. The sample size of this question is _ _ _ _ _.
Answer 20