The crux of Pavlov's work on conditioning was that higher mental processes could be studied in physiological terms

Which of the following statements describes the relationship of age and chronic disease?

Chronic disease increases with age. Chronic disease decreases with age. There is no relationship between chronic disease and age. Chronic disease increases with age in men but decreases with age in women.

The arithmetic mean is a commonly used measure of variability

Indicate whether this statement is true or false.