A dieter believes that the average number of calories in a homemade peanut butter cookie is more than in a store-bought peanut butter cookie. Estimate the difference in the mean calories between the two types of cookies using a 90% confidence interval. The data are 
= 40, 
= 180, 
= 2, 
= 45, 
= 179, and 
= 4, respectively.
Definitions:
Ventricular Contractions
The rhythmic tightening and pumping action of the heart's ventricles, which send blood out to the body (systole) and relax to fill with blood (diastole).
Inferior Vena Cava
The large vein that carries deoxygenated blood from the lower and middle body into the right atrium of the heart.
Saphenous
Referring to veins located in the legs, particularly the great and small saphenous veins, which are often involved in varicose veins and bypass surgery.
Femoral
Femoral refers to anything pertaining to the femur or thigh bone, the longest and strongest bone in the human body.
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