Exercise 6.285 describes a matched pairs study examining the effect of cell phones on brain glucose metabolism. Use the information there to test to see if there is evidence that mean glucose metabolism is higher when a cell phone is nearby. Show all details of the test.

Exercise 4.86 on page 263

Does heavy cell phone use affect brain activity? There is some concern about possible negative effects of radiofrequency signals delivered to the brain. In a randomized matched-pairs study 47 healthy participants had cell phones placed on the left and right ears. Brain glucose metabolism (a measure of brain activity) was measured for all participants under two conditions: with one cell phone turned on for 50 minutes (the ‘‘on” condition) and with both cell phones off (the ‘‘off” condition). The amplitude of radiofrequency waves emitted by the cell phones during the ‘‘on” condition was also measured.