Question Part Points Submissions Used Many studies have suggested that there is

Question

Question Part Points Submissions Used 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. data274.dat (a) Make a table giving the sample size, mean, and standard deviation for each group of rats. Consider whether or not it is reasonable to pool the variances. (Round your answers for x, s, and s_(x^^_) to one decimal place.) Group n x^^_ s s_(x^^_) Control Low jump High jump (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.) F = P = Conclusion: There is statistically significant difference between the three treatment means at the = .05 level.

Explanation / Answer

applying one way ANVOA on above:

frm above test statistic F =6.95

p value =0.004

Groups n xbar s sxbar Control 10 609.7 19.6754 6.2219 Lowjump 10 631.5 14.4780 4.5783 Highjump 10 609 10.4881 3.3166

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