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9. To assess the sales of smartphones, a manager checks if the sales vary with the brands (brands A and B) and with different prices

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9. To assess the sales of smartphones, a manager checks if the sales vary with the brands (brands A and B) and with different prices (between $205-$248, $250-$458, and $460-$520). The sales of smartphones of both the brands are recorded with respect to different prices. a. Determine all degrees of freedom for the above research

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