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by: Mr. Vernie Wehner


Mr. Vernie Wehner
OK State
GPA 3.67

Sondra Nolf

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About this Document

Sondra Nolf
Class Notes
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This 0 page Class Notes was uploaded by Mr. Vernie Wehner on Sunday November 1, 2015. The Class Notes belongs to PSYC 3214 at Oklahoma State University taught by Sondra Nolf in Fall. Since its upload, it has received 23 views. For similar materials see /class/232878/psyc-3214-oklahoma-state-university in Psychlogy at Oklahoma State University.




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Date Created: 11/01/15
z test for means A researcher is testing the effectiveness of a new drug that is intended to improve learning and memory performance A sample of n 16 rats is obtained and the rats are administered the drug and then are tested on a standardized learning task For the general population of rats with no drug the average score on the standardized task is u 50 with a standard deviation of o 10 The drug was found to have a 4 point effect and thus produces a mean score of M 54 for the sample Is this suf cient to conclude that there is a signi cant effect using a twotailed test with x 05 Set up the problem using NHST as we did in class today and draw a conclusion 1 Write your hypotheses in 3valued logic form 2 Sketch a standard normal distribution and set up the rejection region using an a priori pvalue that is alpha equal to 05 As in class the critical values will thus be l96 and 196 3 Compute the mean for the data above 4 Compute zobs using the formula from class 5 Judge whether or not zobs falls in the rejection region and state if your result is statistically signi cant or nonsigni cant 6 Write a brief verbal interpretation of the results 7 Compute and interpret the effect size 8 Compute and interpret the confidence interval


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