A Manufacturer of Cordless Electric Shavers Sampled 13 from a Day's

question 41

Multiple Choice

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 calculated 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:

Contingency Management

A behavioral therapy approach that rewards individuals for demonstrating desired behaviors or achieving specific goals.

Nondepressive Activities

Activities undertaken to promote psychological well-being or alleviate symptoms of depression, focusing on lifting mood and increasing engagement with life.

Providing Sympathy

The act of showing understanding and compassion towards another person’s suffering or hardships.

Irrational Thoughts

Thoughts that are not based on reason or logic, and often stem from misconceptions, fears, or misunderstandings.