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Professor C heng is developing a scale and only uses item-total correlation for decision-making, choosing only items with high item-total correlation. Analyze how this method

Professor Cheng is developing a scale and only uses item-total correlation for decision-making, choosing only items with high item-total correlation. Analyze how this method affects reliability and validity. Explain your reasoning (examples can be used). Comment on and/or suggest how to develop a scale using this method.

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