Question 7.94

64. The proportion of one’s body that is fat is a key indicator of fitness. The many ways to estimate this have different margins of error (given in percentage points):

Method Calipers
pinch		 Bioelectrical
impedance		 Body
mass
index
calculator		 Hydrostatic
weighing
(dunk test)
Margin of error ±3 ±4 ±10 ±1
  1. Which of these tests is the least accurate?
  2. If the pinch test says that you have 21% body fat, what is the 95% confidence interval for this estimate?