Students of Two Sections of a History Course Took a Common

question 47

Multiple Choice

Students of two sections of a History course took a common final examination.The course instructor examines the variance in scores between the two sections.He selects random samples of n₁ = 11 and n₂ = 16 with sample variances of and ,respectively.Assuming that the population distributions are normal,construct a 90% confidence interval for the ratio of the population variance.

• A)[0.90,2.41]
• B)[0.50,2.00]
• C)[0.25,4.00]
• D)[0.79,5.70]

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Definitions:

PLC Installations

The process of setting up and configuring Programmable Logic Controllers (PLCs) in an industrial environment to automate machinery or processes.

Suppression Networks

Circuits designed to reduce or eliminate electrical noise and interference, ensuring stable operation of electronic devices.

Output Modules

Components in automated systems that convert control signals into external actions like turning on a motor or activating a light.

Hardwired Electromechanical

Refers to devices directly connected and controlled via mechanical and electrical components without software intervention.