Lecture 10 Outline of Last Lecture I Review II Probability and Proportions III Random Sampling IV Probability and the Normal Distribution V Determining Probabilities of Obtaining Specific Scores X VI Final Note VII Other Variations Psych 311 Edition 1nd Outline of Current Lecture I Types of Conversions II Extreme Scores Current Lecture I Types of Conversions X Z P You must convert your X into a Z Score using the Z score formula Z X Once you have your Z Score look to column 1 in your Unit Normal Table UNT and find where your Z score falls within that table Figure out if you are analyzing the tail or the body of the distribution These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Look in columns B C or D depending on the question to figure out the proportion of your Z score Z P Find your Z score in the UNT Determine if your question is asking you to analyze the tail or the body Look under columns B or C to find your propability P Z Determine whether your question is talking about the tail or body of your distribution Find your probability score under column B or C depending on question Once you find the score look at what the appropriet Z Score is for that row P Z X Determine whether your question is regarding the tail or body of the distribution Find your probability under column B or C Look under column A of that row to find appropriet Z score Convert your Z score into an X by X Z II Extreme Scores Extreme scores are any scores that are beyond 2 from the mean In psychology the conventional value that represents an extreme score is 5 this is divided between the top 2 5 and bottom 2 5 Extreme scores have a Z score of at least Z 1 96 or 1 96 Column C in UNT The tail of an extreme score always has a probability of at most P 0 025
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