#3 Heart disease patients often experience spasms of the coronary arteries. Because biological amines such as serotonin may play a role in these spasms, a research team measured serotonin levels post-mortem from patients who died of heart disease and from a control group that died of other causes. The data are summarized in the following table:
Heart disease controls
Mean 3.840 5.310
Standard error 850 640
Number 8 12
3.1 Do patients dying of heart disease have serotonin levels significantly different from patients dying of other causes? Justify your answer statistically at the 5% significance level. (Which test did you use? Are you justified in assuming that the variances of the two populations are equal?)
3.2 Given the data, if you were told the serotonin level in the coronary arteries of a cadaver, could you make a fairly confident prediction of whether heart disease was involved? Explain.
3.1 There is insufficient evidence to conclude at 5% level of significance to conclude that patients dying of heart disease have serotonin ...
The solution looks at statistics of heart disease.