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BREES general facts from notes
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- 1What does an ANOVA test for?Differences across the means of two or more unmatched groups.
- 2Assumptions for ANOVAParametric test -
1) Normal distribution
2)homogeneity of variance
3) statistically independant - 3What is F-ratio value for significance?>1 = not significant
- 4Give an example for H0 and H1 for an ANOVA testH0= All groups are equal
H1= The mean of all groups is not equal - 5Give examples of 4 post Hoc tests1) bonferroni (decrease T1 error)
2) studentised newman (increases type one error)
3) tukeys - GOOD ALL ROUND
4) Dunnets for comparison of control vs groups - 6What questions does regression ask? (2)1) how well does data fit theoretical model
2) Can we make predictions of Y based of values of X - 7What is R2? Equation?What % of Y can be explained by X.
SSm
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SSt - 8What is a confounding factor?Outisde factor that impacts our recording of the dependant variable
- 9What is pseudoreplication?You cannot increase 'n' size by taking more readings for the same individual.
- 10Critical values for the Shapiro-Wilks test, Skewness and KurtosisSW - > 0.05 = GOOD
S & K- 0 = GOOD - 11What is internal validity?Small sample size populations are robot and applicable to members of sampled group
- 12External validity?Data from specific groups cannot be generalised to whole populations
- 13What is Haphazard sampling?Illusion of random sampling but factors that you have not taken into account affecting how your choice is made (unintentionally) e.g. curious mouse
- 14—
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