Twenty-four pairs of adult brothers and sisters were sampled at random from a population. The difference in heights,
recorded in inches (brother's height minus sister's height), was calculated for each pair. The 95% confidence interval
for the mean difference in heights for all brother-and-sister pairs in this population was (-0.76, 4.34). What was the
sample mean difference from these 24 pairs of siblings?
O-076 inches
O O inches
O 179 inches
O 4.34 inches