Conduct a sign test to analyze the Stroop data
Assignment 4-3
1. Conduct a sign test to analyze the Stroop data. Evaluate the non-directional hypothesis that congruency of ink colour (congruent or incongruent) affects the speed of reading colour words. [7 points]
- Statethenullandalternativehypotheses.(1point)
- Report the number of subjects used in the analysis. (1 point)
- Reporttheobtainedpvalue,usinga2-tailedevaluation.(1point)
- Suppose you set an alpha level of .05 (2-tailed) at the beginning of the experiment. State your decision with respect to H0 and provide a conclusion. (1.5 points)
- Supposeyousetanalphalevelof.001(2-tailed)atthebeginningofthe experiment. State your decision with respect to H0 and provide a conclusion. (1.5 points) Professor Truong 2017 Page 1 of 2
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Student Name: Student Number: Section Number:
PSYC 218 2017 – Lab Assignment 4 Hypothesis Testing Using the Sign Test
f. Making reference to beta, explain why a researcher would likely not set the alpha level for this experiment to be .001 (2-tailed). (1 point)
- Conduct a sign test to analyze the Memory Span data. Evaluate the directional hypothesis that memory span for letters is shorter than memory span for digits. [6.5 points]
- Statethenullandalternativehypotheses.(1point)
- Report the number of subjects used in the analysis. (1 point)
- Reporttheobtainedpvalue,usinga1-tailedevaluation.(1point)
- Suppose you set an alpha level of .05 (1-tailed) at the beginning of the experiment. State your decision with respect to H0 and provide a conclusion. (1.5 points)
- What is the probability that your decision to reject or retain H0 in 2d represents a Type I error? Explain your answer. (2 points)
- Conduct a sign test to analyze the Change Detection data. Evaluate the directional hypothesis that introducing a flicker increases the ability to detect a change in two nearly identical pictures. [6.5 points]
- Statethenullandalternativehypotheses.(1point)
- Report the number of subjects used in the analysis. (1 point)
- Reporttheobtainedpvalue,usinga1-tailedevaluation.(1point)
- Suppose you set an alpha level of .05 (1-tailed) at the beginning of the experiment. State your decision with respect to H0 and provide a conclusion. (1.5 points)
- Thereisariskinherentinusingadirectionalalternativehypothesis.Howdoes the correct answer to part d show that risk? (2 points)
- Discuss how ties are handled for the sign test. Explain why ties are handled in this manner. [2 points] Professor Truong 2017 Page 2 of 2
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Student Name: Student Number: Section Number:
PSYC 218 2017 – Lab Assignment 4 Hypothesis Testing Using the Sign Test
5. What would you expect to happen to your alpha and beta levels if you were to double the sample size for your experiment? Explain your answer. [2 points]
For TA use:
Total = /24
Late Deductions (3 points for each day late) =
CogLab Deductions (6 points for failure to complete) =
Final Assignment Grade = /24
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Posted 11 Oct 2017 01:10 PM
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