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?

answer: 33 ( approx)

step-by-step explanation:

since, in the linear regression formula, the slope is the a in the equation y = b + ax ( by comparing it with the general equation of line y = mx + c )

where,

here given table is,

price ($), x   :           18         23       25       29       30       33

pairs sold, y :         16         13         10       8         6       2

so, ,   ,   ,

and   ,

thus, slop of the given line is,

⇒  

⇒   ≈ 33