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biology year 2 - exam q > Statistics > Flashcards

Flashcards in Statistics Deck (6)
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1
Q

what will all null hypotheses state?

A
  • there is no significant difference between means

OR

  • correlation

OR

  • difference between categoric data
2
Q

concluding using P values?

A
  • statistical test value exceeds critical value
  • reject/accept null hypothesis (usually reject)
  • prob that X due to chance less than 5%
  • difference between X/correlation = significant
  • state hypothesis correct e.g. height does have an impact on weight
3
Q

describing stats tests?

A
  • construct null hypothesis (if not already done)
  • carry out stats test (say which one)
  • use critical value table to show P less than or equal to 0.05 (less than 5% probability correlation due to chance)
  • use critical value table figure to reject / accept null
4
Q

p is less then or equal to 0.05

A
  • result significant
  • reject null
5
Q

how do you calculate degrees of freedom?

A

number of categories minus 1

6
Q

how do you calculate expected values?

A

observed added together / categories