A box model is used to conduct a hypothesis test for the following scenario: A marketing  firm randomly selects 300 households in a town asking about their annual income. They want to test whether the average household income in the town is $88,000 annually. The average of the ticket values in the box assuming the null hypothesis is true is best described as... a. Random and unknown; it must be estimated b. Random and known c. Fixed and known d. Fixed and unknown; it must be estimated

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