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University of Memphis *

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3020

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Psychology

Date

Feb 20, 2024

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Uploaded by gabriellechavers36

University of Memphis PSYC 3020 I Lab 6 Homework Chi Square Chi-square- Goodness of Fit When taking a multiple choice test, how many times have you thought: “The last two answers were both A so the answer to this question must be something else. Certainly the instructor would not have the same answer for three questions in a row. There are not many questions with the answer D. I wonder if I should put that as the answer.” The answer key for your instructor’s latest exam was requested by twenty different instructors. For each exam, the number of questions with each answer (A, B, C, D, and E) was determined. These data were recorded and are saved in the data file ChiMultchoice.xIsx. Run a goodness-of-fit test to determine if the probability of a given letter is higher than the others. 1. Fill in the following information (Hint: write out as a probability prediction): Ho: pl=p2=p3=p4=p5=1/5 H,: at least one p /= 1/5 2. Use MagicStat to determine if the observed frequencies are significantly different from what is expected. 3. Use the output to fill in the tables below. FREQUENCIES: A C D E Frequency | 10 18 7 4 11 | variable I chi-square stat | df I critical value I P | | Observed freq | 11.0 [4 [949 [.027 | 4. Which hypothesis is supported by the analysis (circle one)? H, University of Memphis PSYC 3020 |

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