A Consumer Group Was Interested in Comparing the Operating Time

question 8

Multiple Choice

A consumer group was interested in comparing the operating time of cordless toothbrushes manufactured by two different companies. Group members 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. The t-test for two means is appropriate in this situation because

• A) the two companies are dependent.
• B) the two companies are independent.
• C) the two companies are matched samples.
• D) the observations are paired.
• E) None of the above.

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Definitions:

Social Desirability

The tendency of respondents to answer questions in a manner that will be viewed favorably by others, potentially leading to bias in surveys or studies.

Open-Ended

Questionnaire or interview questions designed to allow respondents to answer in their own words, rather than selecting from a set of predetermined responses.

Closed-Ended

Pertaining to a question or survey response option that limits answers to a set of predefined choices, making data easier to quantify.

Negative Wording

The use of language with negative connotations or phrasing that can influence the responses or perceptions in surveys and experiments.