Identify which of these types of sampling is used: simple random, stratified, systematic, or convenience.49 students are selected at random from the Sophomore class, 39 from the Junior class, and 48 from the Senior classes.
A. Systematic
B. Stratified
C. Simple random
D. Convenience
Answer: B
You might also like to view...
Solve the problem.Let y(t) be the concentration of a substance in a chemical reaction. The change in the concentration, under appropriate conditions, is modeled by the equation 
where k > 0 is a rate constant and the positive integer n is the order of the reaction. Solve the initial value problem for a third-order reaction 
, assuming y(0) = 3 and k = 0.3.
A. y = 
B. y = 
C. y = 
D. y = - 
Find the first term and the common difference.541, 548, 555, 562, . . .
A. a1 = 541, d = 7 B. a1 = 541, d = 541 C. a1 = 541, d = -7 D. a1 = 541, d = -541
Find fractional notation for the ratio. You need not simplify.In a three-point shooting contest, a basketball player attempted 15 shots and made 13 of them. What is the ratio of shots made to shots attempted?
A. 
B. 
C. 
D. 
Sketch the graph of the conic section given in polar form.r = 
A. 
B. 
C. 
D. 