A box model is used to calculate a confidence interval in the following scenario: A marketing firm randomly selects 500 households in a town asking about their annual income. They want to know the average income of households in the town. Select all the quantities below that are fixed. Leave the quantities that are random unselected. Group of answer choices The sample average of household incomes. The population average of household incomes The EV and SE of sample average of household incomes. The SD of the box.

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