Data collection, collation, finishing Review the description

Data collection, collation, description

1. concept
   1. The introduction of name
      1. All objects, called the study overall
         1. The city eighth graders overall weight of all
      2. Each study objects generally called individual
         1. Each eighth-grade student is an individual's weight
      3. Extracting a portion of the population is called generally a sample
         1. $ 1000 $ students from sampling tests of a sample of the overall weight
      4. The number of individuals in the sample is called sample size
         1. The sample size is $ 1000 $
      5. survey
         1. Is a purpose-made to investigate all the inspection object is called a census
         2. Is a specific purpose of the survey is called the sampling part of the inspection object investigation (referred to as sample !!!)
         3. determining factors
            1. Extensive: large sample size
            2. Representative: extensive sample
            3. Randomness:
   2. summary graph
      1. Sector chart: shows the ratio, typically random, then reflect the overall situation (write data source)
      2. Bar chart: reflect the absolute number and relative size, usually the census
      3. Polyline charts: reflect changes
      4. Frequency distribution histogram: reflect the range
         1. Group Distance: $ \ lfloor \ frac {maximum - minimum number of groups {}} \ rfloor + 1 $
         2. Frequency distribution line chart: focus on the connection surface of the histogram