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mina [271]
3 years ago
8

A research group is interested in gauging perceptions about health club memberships among health club members. Specifically, the

y wish to determine the percentage of monthly paying members in the United States that believe health club memberships are not too expensive. They listed the members of the health club located nearby in alphabetical order and took every tenth member until they succeeded in contacting 150 members. What kind of sampling method have they used? Choose the correct answer below.
A. Cluster sampling
B. Multistage sampling
C. Stratified random sampling
D. Systematic sampling
Mathematics
1 answer:
worty [1.4K]3 years ago
8 0

Answer:

D. Systematic sampling

Step-by-step explanation:

  • Systematic sampling is a type of probability sampling method in which sample members of a large population are selected according to a random starting position and a constant, periodic interval.
  • This interval, called the sample interval, is calculated by dividing the population size by the desired sample size.
  • so correct option is D. Systematic sampling .
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Alexander is working two summer jobs, making $10 per hour washing cars and $8 per hour landscaping. Last week Alexander worked t
IgorLugansk [536]

The system of equations is:

x = 2y

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Solving it, we see that he worked 3 hours landscaping and 6 hours washing cars.

<h3>How to write the system of equations?</h3>

First, we need to define the variables:

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  • y = number of hours landscaping.

We know that Alexander worked twice as many hours washing cars as he worked hours landscaping, then:

x = 2y

We also know that he earned a total of $84, then:

x*$10 + y*8 = $84

So the system of equations is:

x = 2y

x*$10 + y*8 = $84

To solve it, we just replace the first equation into the second one:

(2y)*$10 + y*8 = $84

y*$28 = $84

y = $84/$28 = 3

So He worked 3 hours landscaping, and:

x = 2*y = 2*3 = 6

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If you want to learn more about systems of equations:

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A subtraction equation is 6.88-4.96= w.
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