Mixed reserahc skills revision

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1. A researcher is examining whether background noise affects how quickly we eat. She observes people eating at a restaurant in which music is playing, and at another restaurant where no music is playing. She measures how long it takes for each person to eat

  • Increased the construct validity
  • Increased the external validity
  • Increased the ecological validity
  • Increased the internall validity
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2. Which is a design withoug a control group

  • Matched pairs
  • Interrupted time-series
  • Inepedent groups
  • repeated-time series

3. Prof Hasan is examining differences in happiness between patients with Alzheimer's Disease and healthy controls. What statistical test should he use?

  • Independent samples t-test if the data meets parametric assumptions, and Mann-Whitney U if it doesn't meet parametric assumptions
  • Paired samples t-test if the data meets parametric assumptions, and Wilcoxon Signed Ranks if it doesn't meet parametric assumptions
  • Wilcoxon Signed Ranks if the data meets parametric assumptions, and paired samples t-test if it doesn't meet parametric assumptions
  • Mann-Whitney U if the data meets parametric assumptions, and independent samples t-test if it doesn't meet parametric assumptions

4. A study tested the blood pressure of three groups of tennis players. One group was tested before a game, one group was tested during a game, and one group was tested after a game. The study yielded ordinal data. Which test would you use assess the effect

  • repeated ANOVA
  • Friedman test
  • Kruskal Wallis
  • one way ANOVA

5. A study has used a very small sample size. This may be a threat to:

  • External validity
  • Construct validity
  • Statistical validity
  • Internal validity

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