Many studies have suggested that there is a link between exercise and healthy bones. Exercise stresses the bones and this causes them to get stronger. One study exami- ned the eect of jumping on the bone density of growing rats. There were three treatments: a control with no jumping, a low jump condition (the jump heigth was 30 centimeters), and a high jumping condition (60 cm). In each group there were 10 rats, ie. we had 30 statistical units altogether. After 8 weeks of 10 jumps per day, 5 days per week, the bone density of the rats (mg/cm3) was measured. Does exercise have an eect on the bone density? Write down the hypothesis and interpret the result

View Edit A Select Text . . . . . Dignaity Control Loving Hiphump Lowjump Group Levene's Test for Homogeneity of Variance (center = median) Df F value Pr (>F) group 2 0. 492 0.6168 27 >m.rat.1 summary (m. rat . 1) Df Sum Sq Mean Sq F value Pr (>F) group 2 7434 3717 7.978 0.0019 *# Residuals 27 12579 466> oneway . test (density group, data=rat) One-way analysis of means (not assuming equal variances) data: density and group F - 8.8164, num df = 2.000, denom df = 17.405, p-value - 0.002268