Which of the following statements are TRUE?
I. In an observational study subjects are randomly assigned to treatment groups.
II. A systematic sample is an example of an SRS because every experimental unit has
an equal chance of being chosen.
III. Blocking is for experiments and stratifying is for studies.
A. I only
B. II and III
C. I, II and III
D. I and III
E. III only

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8  

$5.41

step-by-step explanation:

$20 - $14.51 = $5.49.