Answer:To Prevent Bias which may arise from a major difference from personal characteristics.
Explanation: Sampling is a part of a population that is to be used for a research or experiment.
Variables are factors or members of a sample or Population that are can be altered (Dependent variables) in order to create an effect on another variables.
Independent variables are variables that are consistent and are not affected by other variables.
To Prevent BIAS,proper Sampling or inducing independent variables it must include all the factors necessary in an experiment or research.
Answer:
Explanation:More quotes
Summary of Dorothea Lange
Dorothea Lange's images of Depression-era America made her one of the most acclaimed documentary photographers of the 20th century. She is remembered above all for revealing the plight of sharecroppers, displaced farmers and migrant workers in the 1930s, and her portrait of Florence Owens Thompson, Migrant Mother, Nipomo, California(1936), has become an icon of the period. Since much of this work was carried out for a government body, the Farm Security Administration, it has been an unusual test case of American art being commissioned explicitly to drive government policy. After the Depression she went on to enjoy an illustrious career in photo-journalism during its hey-day, working for leading magazines such as Fortune and Life, and traveling widely throughout Asia, Latin America, and Egypt. She was instrumental in assembling the "Family of Man" exhibition at the Museum of Modern Art in New York in 1959, a renowned celebration of struggling post-war humanity.
