Lactation promotes a temporary loss of bone mass to provideadequate amounts of calcium for milk production. The paper “BoneMass Is Recovered from Lactation to Postweaning in AdolescentMothers with Low Calcium Intakes†gave the following data on totalbody bone mineral content (TBBMC) (g) for a sample both duringlactation (L) and in the postweaning period (P):
               Subject                L                             P
               1                             1928                      2126     Â
               2                             2549                      2885
               3                             2825                      2895
               4                             1924                      1942
               5                             1628                      1750
               6                             2175                      2184
               7                             2114                      2164
               8                             2621                      2626
               9                             1843                      2006
               10                          2541                      2627
Estimate the difference between true average TBBMC for the twoperiods of concrete in a way that conveys information aboutprecision and reliability. Does it appear plausible that the trueaverage TBBMCs for the two periods are identical?
