Study 1 > table(gender) gender female male 109 91 > tapply (writing, gender, mean) female male 54.99083 50.12088 > tapply (writing, gender, sd) female male 8.133715 10.305161 1. What is the rescarch question asked? 2. Assuming a = 0.05 and equal standard deviation, calculate the power of the test. 3. For a = 0.05, how large of a sample size is needed to achieve power of 0.90.
Study 1 > table(gender) gender female male 109 91 > tapply (writing, gender, mean) female male 54.99083 50.12088 > tapply (writing, gender, sd) female male 8.133715 10.305161 1. What is the rescarch question asked? 2. Assuming a = 0.05 and equal standard deviation, calculate the power of the test. 3. For a = 0.05, how large of a sample size is needed to achieve power of 0.90.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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