Many studies have suggested that there is a link between exercise and healthy bo
ID: 3172083 • Letter: M
Question
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. data10.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.)
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http://www.webassign.net/mintrostat/data/12_39/data10.dat
Group n s Control Low jump High jumpExplanation / Answer
a)
b) by ANOVA table using excel add in:
F=8.8
P=0.001
ANOVA table:
std dev for population variance Group n ave s std dev for sample variance Control 10 610.0 19.0 20.0 399.8 Low jump 10 652.2 26.6 28.0 784.0 High jump 10 615.9 23.2 24.4 597.2