Question

1. Recently, investigators have become concerned about the dramatic weight loss experienced by participants in a new line of LAT-band surgeries targeted at individuals that are extremely obese. Assuming that dramatic weight loss can be characterized by a loss in BMI of over 7 kg/m², does the following SRS of participants receiving the new LAT-band constitute dramatic weight loss? Assume that a normal approximation is possible. Carry out a paired-sample t test to investigate the hypothesis that those that have received the new LAT band procedure have experienced dramatic weight loss. Interpret your findings.
   

   Participant	Prior to LAT Band BMI (kg/m2)	After LAT Band BMI (kg/m2)
   1	36.7	24.5
   2	37.9	23.7
   3	37.5	22.1
   4	36.6	20.7
   5	37.0	20.9
   6	34.8	19.6
   7	35.2	19.9

Answer 1

using minitab

Paired T for Prior to LAT Band BMI (kg/m2) - After LAT Band BMI (kg/m2)

N Mean StDev SE Mean
Prior to LAT Band BMI (k 7 36.529 1.143 0.432
After LAT Band BMI (kg/m 7 21.629 1.882 0.711
Difference 7 14.900 1.337 0.505

95% CI for mean difference: (13.664, 16.136)
T-Test of mean difference = 0 (vs ≠ 0): T-Value = 29.49 P-Value = 0.000

interpretaion since the p value is zero so at every significance level like at 95% ,90% and 99% we will reject the claim that hat those that have received the new LAT band procedure have experienced dramatic weight loss. Interpret your findings.