Keywords: paired-samples t test, two-sample t test, repeated measures
A study was conducted at a major north eastern American medical centre regarding blood cholesterol levels and heart-attack incidents. A total of 28 heart-attack patients had their cholesterol levels measured two days, 4 days, and 14 days after the attack. In addition, cholesterol levels were recorded for a control group of 30 people who had not had a heart attack. The units of cholesterol measurement are not given in the original reference but are presumably mg/dL of blood.
|Group||1 = heart-attack patient, 2 = control|
|Day||Numbers of days since heart attack|
Ryan, B. F., Joiner, B. L., and Ryan Jr, T. A. (1985). Minitab Handbook Second Edition. Duxbury Press, Boston.
The data is given in Table 1.1 and is attributed as being "from a study conducted by a major northeastern medical center".