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Unformatted text preview: Quantitative Methods in Psychology Quantitative Methods in Psychology July 14th, 2009: zscores July 14th, 2009: zscores Jeff Vietri Jeff Vietri Corresponding to chapter 5 in the text Corresponding to chapter 5 in the text Today's Agenda Today's Agenda Go over homework Answer questions Quiz 2 Zscores! Don't forget the homework Today: standard scores and the Today: standard scores and the normal distribution normal distribution Introduce zscores Short review of prerequisite concepts Population, Sample, Mean, SD (a little) math Discuss uses By the end of the hour By the end of the hour Be able to interpret zscores +/, magnitude Calculate zscores given X, μ, and σ Calculate a raw score given z, μ, and σ Discern approximate percentile rank given a z score Consider this Consider this Imagine you have just been transferred to a position managing a customer service team. Within a few weeks of taking the job, one of your reps, David, says his performance—23 resolutions per hour—clearly merits a raise. I so deserve a raise! What can you do with this What can you do with this information? information? Does his performance merit a pay increase? Is he really a star, or is he trying to take advantage of a change in management? Is 23 resolutions per hour good performance? How can we know? How can statistics help us to describe (quantify) the goodness or badness of an observed score in a way that is easily interpretable? Bringing observations into context Bringing observations into context Single numbers in isolation can be difficult to interpret Is 23 resolutions/hour fast?...
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 Fall '11
 Staff
 Psychology, Normal Distribution, Standard Deviation, ZScores, Standard score, raw score

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