Revision book Practice Q10

Discussion in 'CT3' started by Jeaw5, Mar 23, 2012.

  1. Jeaw5

    Jeaw5 Member

    Hi

    I do not understand the answer to this question. Why are they not using the standard deviation in the formula (square root of npq), (NB p and q have hats)?

    Thanks
    J
     
    Jeaw5, Mar 23, 2012
    #1
  2. John Lee

    John Lee ActEd Tutor Staff Member

    I am a little confused. They are using the correct formula (see Core Reading Q26 or page 16 of Chapter 11).
     
    John Lee, Mar 26, 2012
    #2

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