Answered: An educational psychologist is…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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100%

An educational psychologist is concerned about the effect of distractions on studying. The psychologist selects a random sample of 20 people and asks them to read and study a chapter of a textbook. Ten of the participants are randomly assigned to study the chapter while given the usual access to their cell phones, while the other 10 are assigned to turn their cell phones off and to not turn them on until the study session is completed. After the participants are given 3 hours to read and study, they are given a quiz on the material. The participants who studied with cell phone distractions got an average of 78 on the quiz (SS = 166) and the participants who studied without access to their cellphones got an average of 84 on the quiz (SS = 158). Determine if there is sufficient evidence at the 1% level of significance using a standard two-tailed test that cell phone distractions reduce exam performance. Find a 99% Confidence Interval for the difference between means. What is the upper bound and lower bounds of the confidence interval? Round your answer to 2 decimal places.

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