All of the statements describe needs or problems that can be addressed through the technology design process. However, some may be more directly related to specific technological solutions than others.
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A baseball player needs to improve his batting skills. - This suggests a need for training tools or programs, which can involve technology, but may not always lead to a tangible engineered solution.
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A family needs a garage door that will automatically open when their car approaches. - This clearly indicates a technological solution in the realm of automation and smart home technology.
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A farmer needs a new piece of farm machinery to harvest his crop. - This is a straightforward problem that can be addressed by designing and developing new agricultural technology.
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A community needs a new swimming pool. - This involves design and construction, which can also be approached with a technology design process, though it may not focus on technology in the same sense as other examples.
Among these, the family needing a garage door that will automatically open when their car approaches and the farmer needing new machinery are the strongest examples of problems that can be specifically solved using the technology design process.