Use the Following to Answer the Question(s) Below

question 36

Multiple Choice

Use the following to answer the question(s) below.
A manufacturer of cordless electric shavers sampled 13 from a day's production and found the mean time of continuous usage without recharging to be 410 minutes with a sample standard deviation of 30 minutes. We can assume that times are normally distributed. We wish to test if the true mean operating time without recharging is more than 400 minutes.
-The correct value of the test statistic is

• A) 1.20.
• B) -0.333.
• C) -2.52.
• D) -1.20.
• E) 2.79.

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Definitions:

Formula

An expression or equation that states a rule about a relationship among quantities, often used in mathematics, science, and engineering.

Cam Displacement Diagram

A graphical representation showing the movement of a cam follower over time or rotation of the cam.

Displacement

The distance and direction of an object's movement from its starting point.

Cam Displacement Diagram

Cam Displacement Diagram illustrates the movement (displacement) profile of a cam follower over one complete cycle, facilitating the design and analysis of cam mechanisms.