Identify the type of sampling described by the proposal.Every fifth adult entering an airport is checked for extra security screening.
A. systematic sample
B. convenience sample
C. stratified sample
D. cluster sample
E. simple random sample
Answer: A
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Solve the problem.Water is falling on a surface, wetting a circular area that is expanding at a rate of 
How fast is the radius of the wetted area expanding when the radius is 
(Round your answer to four decimal places.)
A. 0.0089 mm/s B. 112.4689 mm/s C. 0.0559 mm/s D. 0.0178 mm/s
Identify the form of the argument and state whether the argument is valid or invalid.If I'm hungry, then I will eat.I'm not hungry. Therefore, I will not eat.
A. Fallacy of the converse; invalid B. Law of detachment; valid C. Law of contraposition; valid D. Fallacy of the inverse; invalid
Provide an appropriate response.The random variable X has density function f(x) = 
Find (a) P
and (b) P
.
What will be an ideal response?
Solve the given inequality (a related function is graphed).-x3 + 2x2 + 9x - 18 < 0 
x-intercepts: (-3, 0), (2, 0), (3, 0)
A. (-?, -3) ? (2, 3) B. [-3, 2] ? [3, ?) C. (-3, 2) ? (3, ?) D. (3, ?)