A random sample of 78 ninth grade student's scores on a national mathematics assessment testhas a mean score of 264. This test result prompts a state school administrator to declare that themean score for the state's ninth graders on this exam is more than 280. Assume that thepopulation standard deviation is 32. At alpha= 0.05, is there enough evidence to support theadministrator's claim?

Answer: Using the given data, Sample size (n) = 78 Sample mean x¯ = 264 Population standard…

Answered: A random sample of 78 ninth grade…

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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Suppose the scores of students on an exam are normally distributed with a mean of 253 and a standard deviation of 80. According to the empirical rule, what percentage of students scored between 13 and 493 on the exam?
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