Do wearable devices that monitor diet and physical activity help people lose weight? Researchers had 237 subjects, already involved in a program of diet and exercise, use wearable technology for 24 months. They measured their weight (in kilograms) before using the technology and 24 months after using the technology. - 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. Choose the correct explanation.
a) A person's weight before and after wearing the device would be independent; thus, the data from this before and after study should be analyzed using a matched pairs t-test.
b) A person's weight before and after wearing the device would not be independent; thus, the data from this before and after study should not be analyzed using a matched pairs t-test.
c) A person's weight before and after wearing the device would be independent; thus, the data from this before and after study should not be analyzed using a matched pairs t-test.
d) A person's weight before and after wearing the device would not be independent; thus, the data from this before and after study should be analyzed using a matched pairs t-test