11) Hypothesis Testing Flashcards Preview

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Flashcards in 11) Hypothesis Testing Deck (4)
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1
Q

T- test for one mean assumptions

A
  • one sample t-test is valid only if the observations are independent and the distribution of the variable tested is normal
  • distribution of the bariability is not the distribition of the sample means given by the central limit theorem
  • violation of independence would occur if for example some participants were siblings
2
Q

T-test for two means assumption

A
  • observations are independent
  • normal distribution
  • have to distinguish if the groups are paired or not
  • if unpaired groups, we may or may not assume equal variance
3
Q

Non- parametric tests

A
  • do not make assumnptions about the distribution of the variable
  • more flexible but less power
4
Q

Wikcoxon signed rank test

A
  • takes into consideration the magnitude of the difference (unlike sign test)
  • sort the differeences and register the rank of each diffference
  • calculate sum of ranks and divide for sample size
  • average rank of positives