statistics chapter 1: collecting data

statistics chapter 1: collecting data

1. pilot surveys/control groups.

   • Pilot Survey: Small version of sample to see if qs are right and see results
   • Control Group: Used in Drug Trials placebo/two groups etc
   • Questionnaires
     • Closed Question: Specific Answers but may not cover all
     • Open Questions: Any answer but may not get answer needed
     • Leading Questions = Bad

2. Capture Recapture

   • Assumptions: No births or deaths/No migration (same subjects)/marking doesn't affect
   • N=(Mn)/(m)

3. Primary vs Secondary Data

   • Primary Ads: Accuracy known/know how obtained
     • Primary Disads: Time consuming/Expensive
   • Secondary Ads: Easy/cheap to obtain
     • Disads: May be out of data/May contain Mistakes/Method of collection unknown

4. Quantitative/Qualitative

   • Continuous/Discrete
     • Categorical - Sorted into non overlapping categories