examples of a biased sample and an unbiased sample algebra homework help

  1. OPEN ENDED Give examples of a biased sample and an unbiased sample. Explain your 
  2. Writing in Math Use the information on page 761 see attached to explain how surveys are used in 
    marketing. Find the margin of error for those who spend $249 or less if 807 mothers were 
    surveyed. Explain what this margin of error means. 

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