Lab7_Sp08Answers

Lab7_Sp08Answers - Name: _ Lab Partner(s): _ Lab #7 Answers...

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Name: ______________________________ Lab #7 Answers PSY31: Spring 08 Lab Partner(s): ___________________________ Lab Session: _____________ Part I. Is there a psychic in the room? Your lab instructor will conduct a “psychic” experiment at the beginning of lab. Please use your data to answer the following questions. 1) Fill out the table below to match your observed data. Please combine Trials 1 and 2 to have a total of 50 observations: This will vary. I provided you with an example. OBSERVED: # Correct 15 # Incorrect 35 2) Assuming that the null hypothesis is true, what are the expected proportions for these categories? EXPECTED: # Correct 10 (N*.20) # Incorrect 40 (N*.80) 3) What Χ 2 distribution is appropriate for these tests? Which Χ 2 test is this? Why? Χ 2 (1) Goodness of Fit One nominal variable; matching an observed distribution to an expected distribution 4) What is our critical value for Χ 2 for this test? X 2 (1) = 3.841 5) Conduct the Χ 2 test (statistical significance). Show your work. Report the observed value of Χ 2 and p (i.e., > or < .05). Χ 2 (1, N=50) = 3.125, p > 0.05 (retain the null) 2 2 22 () (1, 20) (15 10) (35 40) 10 40 3.125 OE N E χ == −− =+ =
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Name: ______________________________ Lab #7 Answers PSY31: Spring 08 6) What is your conclusion based on the outcome of this test?
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This note was uploaded on 04/07/2008 for the course PSY 031 taught by Professor Dicorcia during the Spring '08 term at Tufts.

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Lab7_Sp08Answers - Name: _ Lab Partner(s): _ Lab #7 Answers...

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