RESEARCHERS FROM BUREAU OF LABOR STATISTICS INTEND TO DRAWCONCLUSIONS ABOUT THE UNKNOWN POPULATION VARIANCE FORSALARY FOR A GROUP OF ENGINEERS. A SAMPLE OF 16 SALARY RECORDSMEASURED IN ($1,000) IS COLLECTED. ASSUME THAT THE INDIVIDUALSALARY (X) IS NORMALLY DISTRIBUTED WITH THE UNKNOWNPARAMETERS. THE SAMPLE SUMMARIES WERE FOUND AS(X-BAR) = 75.84 AND THE SAMPLE STANDARD DEVIATION = 3.6.A. FIND THE 95% CONFIDENCE LIMITS FOR THE POPULATIONVARIANCE.UCL =LCL =B. PRESENT THE CRITICAL VALUES YOU WILL USE.C. AT THE SIGNIFICANCE LEVEL OF 1%, DO YOU HAVE SUFFICIENTEVIDENCE TO CONCLUDE THAT THE POPULATION VARIANCE WOULDBE BELOW 36? ANSWER YES (REJECT) OR NO (DO NOT REJECT).D. SHOW THE CRITICAL VALUE, THE TEST STATISTIC VALUE, AND STATETHE REJECTION RULE BEFORE ANSWERING THE PREVIOUS QUESTION.




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