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blindpet last won the day on September 27 2014

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About blindpet

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    IB Psych Tutor

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    May 2008
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  1. blindpet

    Will replication of Asch for IA be acceptable?

    Do not use Asch, it's pretty clear from the ethical guidelines for IA that the study isn't allowed. Stroop is the easiest to carry out at short notice in my opinion.
  2. blindpet

    Using abbreviations in psych exams

    Abbreviations are fine if they are used correctly. The first time you mention the word you want to abbreviate it should be in parentheses e.g. participants (P's) which communicates it properly. I would suggest making the abbreviations capital so they stand out a bit more. If your abbreviations affect the readability for the examiner then it could cost you marks.
  3. If the source doesn't cite the articles I would find another source, how can you trust a source that lists no sources? If multiple sources are referenced the you go find those sources and see which one is the most likely/relevant
  4. You should ideally only cite proper journal articles. Most wikipedia or other articles will link to the original source articles in journals.
  5. Fisher's exact test would be good and is what is used elsewhere for the same research http://www.fitelson.org/probability/wason.pdf You shouldn't lose marks but it will take up words so you should be mindful of that as you will not get marked up for including Fisher's test (it's not part of any assessment criterion). The table will show the distribution of scores which is the best you will get for your nominal data.
  6. Which research are you replicating? What were your independent and dependent variables? You can still get the spread by doing the average of the data (it will be between 0 and 1) so you'll get a standard deviation, of course showing a table of the distributed yes and no will be much easier for the user to read, that table shows the spread of data. With binary choice data you can use chi squared or logistic regression but they are beyond the scope of psychology SL I believe.
  7. blindpet

    Biology and cognition - is it an 8 or 22 marker?

    It is clearly laid out in the syllabus which command terms are used for LAQs and Explain is not one of them.They do mention in the syllabus that SAQ command terms can be applied to LAQ command term questions, however this isn't really a problem since the SAQ command terms do not require more knowledge to answer than the LAQ ones.
  8. blindpet

    Inferential Statistics, please help

    It has been a while since I did it manually but that sounds right, if t is higher than critical value then the null hypothesis is rejected (for some statistical tests the critical value needs to be less than).
  9. blindpet

    Inferential Statistics, please help

    Tails refer to the direction of the hypothesis. When you have clear theoretical reasons to predict one condition will be greater than another then you use a one-tailed test. When you have no theoretical grounds and just assume there will be a difference then you use a two-tailed test. http://www.ats.ucla.edu/stat/mult_pkg/faq/general/tail_tests.htm
  10. blindpet

    Inferential Statistics, please help

    You're welcome, good luck
  11. blindpet

    Inferential Statistics, please help

    37 participants sounds large enough to use a t-test instead of the wilcoxon non-parametric version.
  12. blindpet

    Inferential Statistics, please help

    There is not much to explain, the repeated measures t-test examines the variance between the means between the first trial and the second trial and looks up the value it returns in a table to calculate the probability the results occurred from chance. If the p value is small enough you conclude the results did not occur from chance and instead from the treatment manipulation you used in your experiment.
  13. blindpet

    Inferential Statistics, please help

    There are multiple versions of the t-test, there is one for independent measures and one for repeated measures.
  14. blindpet

    Inferential Statistics, please help

    Your teacher should explain to you that this is a within subjects design, also called a repeated measures design. Your data are interval/ratio since they are times and have an absolute 0 (meaning 0 actually means no time taken). You can use a related t-test for your data to get the p-value. If you have a small sample size you can use the Wilcoxon t-test, even though it is a non-parametric test (for ordinal data like rating the attractiveness of a person out of 10), it can be more robust for small sample sizes with interval/ratio data. You can justify the use of either test, there are online calculators that will return the right values. Remember to report the mean and standard deviation when making your tables and graphs and the p value from the inferential test. Good luck!
  15. You didn't mention which design you used but it looks like it was repeated measures. Your data are ordinal so a t-test is not appropriate. If it was a repeated measures test (all participants rated all of the photos) then you should use a Wilcoxon t-test. If it was independent measures (between subjects), then you should use the Mann Whitney U test. These are just to look for differences between the groups (if you wanted to look for interactions then you would use the Kruskal Wallis or Friedman's test). You mentioned you were looking for a correlation in which case you should use Spearman's Rho since your data are ordinal (it is the non-parametric equivalent of the Pearson test). For Spearman's you would run the raw data and not the means, plot the data and report the correlation coefficient.

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