29 Wearable technology and weight loss. Do wearable devices that monitor diet and physical activity help peo- ple lose weight? Researchers had 237 subjects, already involved in a program of diet and exercise, use wear- able technology for 24 months. They measured their weight (in kilograms) before using the technology and 24 months after using the technology.18 (a) Explain why the proper procedure to compare the mean weight before using the wearable technology and 24 months after using the wearable technology is a matched pairs t test. (b) The 237 differences in weight (weight after 24 months minus weight before using the wearable technology) had x = -3.5 and s = 7.8. Is there significant ou nge of