# Step 4 determine the samples score on the comparison

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Step 4) Determine the sample’s score on the comparison distribution.
Step 5) Decide whether to reject the null hypothesis.
WEEK FOUR INDIVIDUAL314. Based on the information given for each of the following studies, decidewhether to reject the null hypothesis. For each, give (a) the Z-score cutoff (orcutoffs) on the comparison distribution at which the null hypothesis should berejected, (b) the Z score on the comparison distribution for the sample score, and(c) your conclusion. Assume that all populations are normally distributed (Aron. A. Aron. E. N. & Coups. E. J., 2009).PopulationStudy Sample Score p Tails of TestA 5 1 7 .05 1 (high predicted)B 5 1 7 .05 2C 5 1 7 .01 1 (high predicted)D 5 1 7 .01 2PopulationStudy Sample Score p Tails of TestA 100.0 10.0 80 .05 1 (low predicted)B 100.0 20.0 80 .01 2C 74.3 11.8 80 .01 2D 16.9 1.2 80 .05 1 (low predicted)E 88.1 12.7 80 .05 2(Aron. A. Aron. E. N. & Coups. E. J., 2009) Study A:
WEEK FOUR INDIVIDUAL4Z score = (7 – 5) ÷ 1 = 2a) 0.05 significance level; Z score is + 1.64b) Z score cut-off value = + 1.64