Derrick and Gareth recorded the number of minutes they slept each night for 15 nights:
*Derrick:* 420, 435, 440, 415, 380, 400, 430, 450, 210, 445, 425, 445, 450, 420, 425
*Gareth:* 360, 420, 460, 430, 480, 340, 450, 490, 500, 460, 330, 470, 340, 480, 370
a. a Calculate the range and interquartile range for each data set.
b. b Which person's data has the lower:
i range ii interquartile range?
c. c Which measure of spread is more appropriate for determining who is generally the more consistent sleeper? Explain your answer.