Null Hypothesis: Investing 10% more in the marketing department will not result in increased sales., Regularly changing the menu in the restaurant will not affect customer retention and increase overall revenue., Increasing the cost of products by 2% will not result in a loss of customer retention., Alternative hypothesis: Investing 10% more in the marketing department will result in increased sales., Regularly changing the menu in the restaurant will affect customer retention and increase overall revenue., Increasing the cost of products by 2% will result in a loss of customer retention.,

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