1. Make a sampling plan for replicating Experiment 4 of Ottati et al. (2015; see the date file in the Lesson 12 assignment). In this study, 50 participants were recruited. Each was assigned to either an easy or difficult trivia test (n = 25 for each group). Participants then completed a scale of Open-Minded Cognition. Those who had taken the difficult test were more open-minded (M= 5.376,s= 1.15) than those who took the easy test (M= 4.615,s= 1.15).

Find the effect size for the original study and its MoE (you can obtain these withSummary twofrom ESCI).

2.

When planning with assurance, what sample size would be required to be at least as precise as the original study (same MoE or smaller)?

3.

When planning with assurance, what sample size would be required to obtain MoE half as big as the expected effect size?

4.

Describe your sampling plan, including the target sample size you would set for a replication of the study.

5.Make a sampling plan for replicating Experiment 6 of Ottati et al. (2015; the summary data are not shown). This was a within-subjects study with 59 participants. Participants imagined two scenarios in counterbalanced order. In one scenario, they had high expertise compared to others in their group; in the other scenario, they had low expertise. After each scenario, participants completed a measure of Open Minded Cognition. Participants reported higher open-mindedness in the low-expertise scenario (M= 5.23,s= 1.03) than in the high-expertise scenario (M= 4.36,s= 1.27). The correlation between repeated measures wasr= 0.687 (be sure to round to 0.69 when entering), and the standard deviation of the difference scores wass_diff= 1.06.

Find the effect size from the original study and its MoE (you can obtain these withSummary pairedfrom ESCI).

6.When planning with assurance, what sample size would be required to be at least as precise as the original study (same MoE or smaller)?

7 . When planning with assurance, what sample size would be required to obtain MoE half as big as the expected effect size?

8.

Describe your sampling plan, including the target sample size you would set for a replication of the study.