Will a 5 across-the-board raise increase the spread of the, Ask an Expert

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Suppose that the teachers in the previous exercise each receive a 5% raise. the amount of the raise will vary from $1500 to $3000, depending on present salary. Will a 5% across-the-board raise increase the spread of the distribution as measured by the distance between the quartiles? Do you think it will increase the standard deviation?

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