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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