Consider the Following to Answer the Question(s) Below

question 30

Multiple Choice

Consider the following to answer the question(s) below:
A consumer group was interested in comparing the operating time of cordless toothbrushes manufactured by two different companies. They took a random sample of 18 toothbrushes from Company A and 15 from Company B. Each was charged overnight and the number of hours of use before needing to be recharged was recorded. Company A toothbrushes operated for an average of 119.7 hours with a standard deviation of 1.74 hours; Company B toothbrushes operated for an average of 120.6 hours with a standard deviation of 1.72 hours. Do these samples indicate that Company B toothbrushes operate more hours on average than Company A toothbrushes?
-Which of the following statements is true?

• A) This is a one-tailed test of two dependent means.
• B) This is a two-tailed test of two independent means.
• C) This is a one-tailed test of two independent means.
• D) These samples are matched.
• E) This is a two-tailed test of two dependent means.

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Definitions:

Tropic Hormones

Hormones that have other endocrine glands as their target, stimulating them to release other hormones.

Anterior Pituitary

The front portion of the pituitary gland, which secretes hormones that regulate a wide range of bodily functions, including growth, reproduction, and metabolism.

Prolactin

A hormone produced by the anterior pituitary gland that stimulates milk production after childbirth.

Last Trimester

The final third of a pregnancy, typically encompassing weeks 28 through 40, characterized by significant growth and development of the fetus.