Data: Many studies have suggested that there is a link between exercise and heal

Question

Data:

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 examined the effect of jumping on the bone density of growing rats. There were three treatments: a control with no jumping, a low-jump condition (the jump height was 30 centimeters), and a high-jump condition (60 centimeters). After 8 weeks of 10 jumps per day, 5 days per week, the bone density of the rats (expressed in mg/cm3 ) was measured. Here are the data. data305.dat

(b) Run the analysis of variance. Report the F statistic with its degrees of freedom and P-value. What do you conclude? (Round your test statistic to two decimal places and your P-value to three decimal places.)

Conclusion: There is  ---Select---  no a statistically significant difference between the three treatment means at the = .05 level.

Group n s Control 10 Low jump 10 High jump 10

Explanation / Answer

from above F=7.6732

p=0.0023

There is a statistically significant difference between the three treatment means at the = .05 level

Groups n Xbar S Sxbar Control 10 597.200 32.880 5.734 Lowjump 10 632.900 11.522 3.394 Highjump 10 601.400 16.574 4.071 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 7614.6 2 3807.3000 7.6732 0.0023 3.3541 Within Groups 13396.9 27 496.1815 Total 21011.5 29

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