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What type of threat to validity would clients'' diet change

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A physical trainer wants to compare the effects of two types of exercise programs on weight loss. He divides his clients into two groups: one focused on short-interval circuit training and one focused on a cardio warm-up followed by a free-weight workout. Without his knowledge, some of his clients have decided to cut out carbohydrates in their diet with the hope of increasing their weight loss. What type of threat to validity would the clients' diet change introduce?

Reference no: EM13883879

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