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SVETLANKA909090 [29]
3 years ago
7

Nissan wants to administer a satisfaction survey to its current customers. Using their customer​ database, the company randoml

y selects 50 customers and asks them about their level of satisfaction with the company. What type of sampling is​ used?
Mathematics
1 answer:
Irina-Kira [14]3 years ago
3 0

Answer: simple random sampling

Step-by-step explanation:

  • A simple random sampling is a sampling method in which individuals are chosen randomly from the population. In this each individual has equal chances to get selected.
  • If N is the population size , then for any individual , the chances for getting selected is \dfrac{1}{N}.

As per given , the company randomly selects 50 customers directly from the database without applying any further steps and asks them about their level of satisfaction with the company.

Thus , the sampling technique used here is simple random sampling.

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In how many ways can 10 people be divided into three groups with 2, 3, and 5 people respectively?
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Answer:

2100

Step-by-step explanation:

In how many ways can a group of 10 people be divided into three groups consisting of 2,3, and 5 people?

First, you need to choose 4 people to fill the first group.

The number of ways is (104) which equals to 210.

Then, pick 3 more people out of the remaining 6 to be in the second group. And then, pick 3 more out of the remaining 3.

However, we need to divide it by 2, since we don’t really care on the order of selection of group.

(63)(33)/2=10

So, there are 210 x 10 = 2100 ways

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