Để ước lượng trong hồ có bao nhiêu cá, người ta bắt lên 1000 con, đánh dấu, rồi thả trở lại hồ. Một thời gian sau, bắt lên 100 con thì thấy có 80 con có dấu của lần bắt trước . Hãy ước lượng khoảng đối xứng cho số cá có trong hồ với độ tin cậy 95% A. [120; 780]
B. [1138; 1386]
C. [678; 870]
D. [900; 1000]

Ajustification for job training programs is that they improve worker productivity. suppose that you are asked to evaluate whether more job training makes workers more productive. however, rather than having data on individual workers, you have access to data on manufacturing firms in ohio. in particu- lar, for each firm, you have information on hours of job training per worker (training) and number of nondefective items produced per worker hour (output). (i) carefully state the ceteris paribus thought experiment underlying this policy question. (ii) does it seem likely that a firm’s decision to train its workers will be independent of worker characteristics? what are some of those measurable and unmeasurable worker characteristics? (iii) name a factor other than worker characteristics that can affect worker productivity. (iv) if you find a positive correlation between output and training, would you have convincingly established that job training makes workers more productive? explain.

In most states, a licensee must provide a(n) of any existing agency relationships to all parties

Which of these is not a result of regular exercise