Consider the Following to Answer the Question(s) Below

question 2

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?
-At α = 0.05

• A) We reject the null hypothesis.
• B) We fail to reject the null hypothesis.
• C) We can conclude that there is no significant difference between the mean operating times of cordless toothbrushes manufactured by the two companies.
• D) We fail to reject the null hypothesis and can conclude that there is not enough evidence to indicate that Company B cordless toothbrushes operate longer on average than those of Company A.
• E) No conclusion can be made regarding the hypothesis.

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Definitions:

Herbivores

Organisms that primarily eat plants, including leaves, flowers, stems, and sometimes roots, for their nutrition.

Autotrophs

Organisms capable of producing their own food from inorganic substances using light or chemical energy, without consuming organic substances from other organisms.

Heterotrophs

Organisms that cannot synthesize their own food and rely on other organisms — both plants and animals — for nutrition.

Trophic Levels

Refers to the hierarchical levels in an ecosystem, categorized by how energy is obtained, ranging from producers to primary consumers and up to apex predators.