1. Suppose you are planning an experiment for a class project with a group of students...
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1. Suppose you are planning an experiment for a class project with a group of students and you have reached the point at which you need to decide how many subjects you will assign to each of the treatment conditions. Let's suppose that your group has decided to study the effects of various background noises on reading comprehension-specifically: silence, soft recorded conversation, light classical music, and musical selections recorded from a local "top-40" radio station. Your group expects to find a "large" effect as a result of these manipulations. A. Estimate the sample size you will need to achieve a power of .90, using a 5% level of significance. B. Suppose that you feel a "large" effect is not a realistic estimate and argue for using a "medium" effect to estimate sample size. What sample size will your group need now to achieve the same degree of power? C. Let's assume that the sample size calculated in part (B) is simply not possible to achieve by your group given the time available to complete the study. After much argument, a compromise is reached in which the group decides to set the estimated effect size equal to .10. What sample size do you now need? D. Some members of your group still feel that steps could be taken to reduce the estimated sample size some more. They suggest that the group could live with a small decrease in power--from .90 to .80. What sample size would you now need, still using an estimated effect size of .10? 1. Suppose you are planning an experiment for a class project with a group of students and you have reached the point at which you need to decide how many subjects you will assign to each of the treatment conditions. Let's suppose that your group has decided to study the effects of various background noises on reading comprehension-specifically: silence, soft recorded conversation, light classical music, and musical selections recorded from a local "top-40" radio station. Your group expects to find a "large" effect as a result of these manipulations. A. Estimate the sample size you will need to achieve a power of .90, using a 5% level of significance. B. Suppose that you feel a "large" effect is not a realistic estimate and argue for using a "medium" effect to estimate sample size. What sample size will your group need now to achieve the same degree of power? C. Let's assume that the sample size calculated in part (B) is simply not possible to achieve by your group given the time available to complete the study. After much argument, a compromise is reached in which the group decides to set the estimated effect size equal to .10. What sample size do you now need? D. Some members of your group still feel that steps could be taken to reduce the estimated sample size some more. They suggest that the group could live with a small decrease in power--from .90 to .80. What sample size would you now need, still using an estimated effect size of .10?
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A You will need a minimum of 400 subjects to achieve a power of 90 A power of 90 means that there is ... View the full answer
Related Book For
Statistics for the Life Sciences
ISBN: 978-0321989581
5th edition
Authors: Myra Samuels, Jeffrey Witmer, Andrew Schaffner
Posted Date:
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