Question

Do wearable devices that monitor diet and physical activity help people lose weight? researchers had 237 subjects who were 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. the 237 differences in weight (weight after 24 months minus weight before using the wearable technology) had x＝-3.5 ands=7.8. let u be the mean weight difference.Complete the test to see if there is significant evidence of a reduction in weight after using the wearable technology. What is the correct null and alternative hypothesis?

a.) H0:?>0 versus Ha:?<0
b.) H0:?=0 versus Ha:?<0
c.) H0:?=0 versus Ha:??0
d.) H0:?<0 versus Ha:?=0

Answer 1

The correct null and alternative hypothesis for the scenario is µ = 0 (null hypothesis) and µ < 0 (alternative hypothesis) respectively.

Step-by-step explanation:

The correct null and alternative hypothesis for the given scenario is:

Null Hypothesis (H0): µ = 0 (There is no significant reduction in weight after using the wearable technology)

Alternative Hypothesis (Ha): µ < 0 (There is a significant reduction in weight after using the wearable technology)