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(1)You test your shoe size in a Brannock device (that metal thing that tests your shoe size). It tells you that your shoe size is

(1)You test your shoe size in a Brannock device (that metal thing that tests your shoe size). It tells you that your shoe size is 10. You test it again one hour later, and once again, your shoe size is 10. Is this measure reliable? Is it a valid measure of your statistics knowledge?

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