Using the data from the previous question on LDL cholesterol,you decide to test if the variance in LDL cholesterol of patientsadmitted to the hospital with a heart attack is the same as that ofthose who have not (the control). You use the R function var.testand obtain the following output.
Ă‚Â Ă‚Â F test to compare two variances
data:Ă‚Â Ă‚Â ldl.ha and ldl.cont
F = 7.683, num df = 9, denom df = 15,
Ă‚Â Ă‚Â p-value = 0.0006501
alternative hypothesis: true ratio of
variances is not equal to 1
95 percent confidence interval:
2.460444 28.960945
sample estimates:
ratio of variances
Ă‚Â Ă‚Â Ă‚Â Ă‚Â Ă‚Â Ă‚Â Ă‚Â Ă‚Â Ă‚Â Ă‚Â 7.683258
What is your decision and conclusion (with respect to variation inLDL cholesterol levels) from the above R test output assuming analpha level of 0.05? AND how does this help us beyond this test ofthe variance?
