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July+14th+slides - Quantitative Methods in Psychology...

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Unformatted text preview: Quantitative Methods in Psychology Quantitative Methods in Psychology July 14th, 2009: z-scores July 14th, 2009: z-scores 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 Z-scores! Don't forget the homework Today: standard scores and the Today: standard scores and the normal distribution normal distribution Introduce z-scores 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 z-scores- +/-, magnitude Calculate z-scores 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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July+14th+slides - Quantitative Methods in Psychology...

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