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A research team conducted a study of VARIABILITY in students' test performance. Researchers assume that individual records are normally distributed with unknown mean and variance. They collected a sample of n = 25 test scores with summaries shown below. Sample Mean = X = 75.2 and Sample SD = S = 15 1. At the significance level, a = 0.01, do researchers have sufficient evidence that the POPULATION VARIANCE would be ABOVE 120? • Show critical value • Evaluate Test Statistic • Formulate Rejection Rule • State your decision

A research team conducted a study of VARIABILITY in students' test performance. Researchers assume that individual records are normally distributed with unknown mean and variance. They collected a sample of n = 25 test scores with summaries shown below. Sample Mean = X = 75.2 and Sample SD = S = 15 1. At the significance level, a = 0.01, do researchers have sufficient evidence that the POPULATION VARIANCE would be ABOVE 120? • Show critical value • Evaluate Test Statistic • Formulate Rejection Rule • State your decision

MATLAB: An Introduction with Applications
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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A research team conducted a study of VARIABILITY in students' test performance. Researchers assume that individual records are normally distributed with unknown mean and variance. They collected a sample of n = 25 test scores with summaries shown below. Sample Mean = X = 75.2 and Sample SD = S = 15 1. At the significance level, a = 0.01, do researchers have sufficient evidence that the POPULATION VARIANCE would be ABOVE 120? • Show critical value • Evaluate Test Statistic • Formulate Rejection Rule • State your decision 2. At the significance level, a = 0.01, do researchers have sufficient evidence that the POPULATION VARIANCE would be BELOW 540? • Show critical value • Evaluate Test Statistic • Formulate Rejection Rule • State your decision Solution
Transcribed Image Text:A research team conducted a study of VARIABILITY in students' test performance. Researchers assume that individual records are normally distributed with unknown mean and variance. They collected a sample of n = 25 test scores with summaries shown below. Sample Mean = X = 75.2 and Sample SD = S = 15 1. At the significance level, a = 0.01, do researchers have sufficient evidence that the POPULATION VARIANCE would be ABOVE 120? • Show critical value • Evaluate Test Statistic • Formulate Rejection Rule • State your decision 2. At the significance level, a = 0.01, do researchers have sufficient evidence that the POPULATION VARIANCE would be BELOW 540? • Show critical value • Evaluate Test Statistic • Formulate Rejection Rule • State your decision Solution
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