The recommended daily dietary allowance for zinc among males older than age 50 years is 15 mg/day. The article “Nutrient Intakes and Dietary Patterns of Older Americans: A
National Study” (J. Gerontol., 1992: M145-150) reports the following summary data on
intake for a sample of males age 65-74 years: n = 115, ¯x = 11.3, and s = 6.43. Does this
data indicate that average daily zinc intake in the population of all males age 65-74 falls
below the recommended allowance?