A Company Has Developed a New Ink-Jet Cartridge for Its

question 169

Multiple Choice

A company has developed a new ink-jet cartridge for its printer that it believes has a longer life-time on average than the one currently being produced. To investigate its length of life, 225 of the new cartridges were tested by counting the number of high-quality printed pages each was able to produce. The sample mean was determined to be 1511.4 pages. The population standard deviation is known to be 35.7 pages. The historical average lifetime for cartridges produced by the current process is 1502.5 pages.
-The appropriate test statistic to test the hypotheses is _____.

• A)56.09
• B)3.74
• C)22.34
• D)-3.74
• E)-22.34

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Definitions:

Timing Relays

Electromechanical devices that enable timed events in a control circuit, such as delays in switching.

Contactors

Electrically controlled switches used for switching an electrical power circuit, similar to a relay but capable of handling higher currents.

Armatures

The component of an electric machine (like a motor or generator) that carries alternating current and interacts with a magnetic field to produce motion.

Yoke

In electrical engineering, a yoke is the frame that holds or supports magnetic core materials in devices like transformers or some types of motors, contributing to the magnetic circuit's path.