Seven-year-old Sangram is not allowed to touch the television remote. Nevertheless, he uses the remote to change the volume from level 15 to 17. His parents, who are in the next room, seem unaware. The next day, Sangram becomes bold and turns the volume from level 15 to 30. His father yells at him, “Stop playing with the remote!” What prevented Sangram’s father from noticing the volume change on the previous day??
a. ?The change on the first day failed to exceed his father’s difference threshold.
b. ?The change on the second day failed to exceed his father’s fixed threshold.
c. ?The change on the first day exceeded his father’s absolute threshold.
d. ?The change on the second day was higher than his father’s distinct threshold.
Answer: a
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