Our interest in the design of machines for human use runs the full gamut of
machine complexity – from the design of single instruments to the design of
complete systems of machines which must be operated with some degree of coordination. - A. Chapanis, W. Garner, & C. Morgan, 1949
THEORETICAL FOUNDATIONS (Things we consider)
1. Action classification
Errors of omis
2.3. Strategies Against Competitors
2.3.1 Cheap Price
The distribution system between Korea and America is very different. The price with same goods in America is cheaper than in Korea. Especially season sail has the cost cut about 60~70% WizWid buys mass quantity of goods and prepares for shortage of products. It can cut their selling price very much.
2.3.2. Brand Loyalty: First-mover Advan
1.2 Segmentation
With the development of the internet and constant advances it has been able to make we, today, have a society where almost all people enjoy the creative innovation In order to jump into this new industry of e-commerce, WizWid carried out an extensive research on the usage of internet by different age groups.
WizWid found out that people were using the internet regardless of th
표본 평균의 평균은 모집단의 평균과 같다.
E(X) = μ = E(X) = μ x
3. 표본 평균의 표준편차는 모집단의 표준편차를 을
나눈 것과 같다.
4. 모집단의 분포가 정규분포가 아닐 때에도, 표본의 크기
가 커지면, 표본평균의 표본 분포는 정규분포에 근사한다.
이를 중심극한정리(central l