Consider the Following to Answer the Question(s) Below

question 6

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 for the difference in the means of two dependent groups.
• B) This is a two-tailed test for the difference in the means of two independent groups.
• C) This is a one-tailed test for the difference in the means of two independent groups.
• D) These samples are matched.
• E) This is a two-tailed test for the difference in the means of two dependent groups.

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Definitions:

Long Run

A period in which all factors of production and costs are variable, allowing firms to adjust to market conditions.

Plant Size

The physical capacity or scale of a manufacturing facility, which can influence production output and operational efficiency.

Factors Of Production

The resources used in the creation of goods or services, traditionally categorized into land, labor, capital, and entrepreneurship.

Short Run

A period in economics where at least one input (like capital) is fixed, limiting the ability of a firm to adjust fully to market changes.