Hypothesis Test for Proportions - continuity correction

Discussion in 'CT3' started by CramerRao, Apr 21, 2014.

  1. CramerRao

    CramerRao Member

    Hello,

    I'm a bit confused about when to include the continuity correction factor when carrying out a hypothesis test on the proportion of a population. For example, in the September 2006 Question 5 I would've thought that the solution should read : (0.34 + 0.5/200 -0.4) on the numerator of the test statistic? Obviously the effect of including this would be minimal but if the sample size was smaller should the continuity correction factor be included?

    Thanks in advance!!
     
  2. John Lee

    John Lee ActEd Tutor Staff Member

    68 females out of 200 so should be:

    \(\frac{\frac{68+0.5}{200} - 0.4}{\sqrt{0.24}}\)

    So I agree with you....not sure whose solutions you are looking at...
     
  3. CramerRao

    CramerRao Member

    Hi John thanks for the reply and for clearing that up. The Institute's solution only has 68/200 when calculating it using the proportions but does include the continuity correction when working in numbers of policyholders.
     

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