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Fudgin [204]
3 years ago
14

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

randomly selects 8080 customers and asks them about their level of satisfaction with the company.
Identify which of these types of sampling is​ used: random,​ systematic, convenience,​ stratified, or cluster.
Mathematics
1 answer:
shtirl [24]3 years ago
5 0

Answer: Random

Step-by-step explanation:

  • In statistics , a random sampling technique is a simple sampling technique in which researcher choose 'n' individuals from N population , such that the chances for each individual to get selected are equal as \dfrac{1}{N}.

Here , the company wants to administer a satisfaction survey to its current customers.

So , Population → All current customers

Using their customer​ database, the company randomly selects 80 customers , it means each customer had the same chance to get selected.

Hence, the type of sampling is​ used : Random sampling

Hence, the correct answer is "Random" .

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Cloud [144]

Answer and Step-by-step explanation:

6(2x + 3y - 10) is the answer.

This is because 6 can be taken out from all 3 numbers, and will create these two factors, the factors being 6 and (2x + 3y - 10).

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2 years ago
Read 2 more answers
A shipment of 50 precision parts including 4 that are defective is sent to an assembly plant. The quality control division selec
natali 33 [55]

Answer:

0.3968 = 39.68% probability this shipment passes inspection.

Step-by-step explanation:

The parts are chosen without replacement, which means that the hypergeometric distribution is used to solve this question.

Hypergeometric distribution:

The probability of x successes is given by the following formula:

P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}

In which:

x is the number of successes.

N is the size of the population.

n is the size of the sample.

k is the total number of desired outcomes.

Combinations formula:

C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

In this question:

50 parts means that N = 50

4 defective means that k = 4

10 are chosen, which means that n = 10

What is the probability this shipment passes inspection?

Probability that none is defective, so:

P(X = x) = h(x,N,n,k) = \frac{C_{k,x}*C_{N-k,n-x}}{C_{N,n}}

P(X = 0) = h(0,50,10,4) = \frac{C_{4,0}*C_{46,10}}{C_{50,10}} = 0.3968

0.3968 = 39.68% probability this shipment passes inspection.

6 0
2 years ago
Help please 6x^2-18
prohojiy [21]

Answer:

6(x^2-3)

Step-by-step explanation:

5 0
3 years ago
Can you please help me with number 21 please
yKpoI14uk [10]

Answer:

well it simply tells you if you think your right on all of them then press yes if not press no

8 0
2 years ago
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yawa3891 [41]

Answer:

C

Step-by-step explanation:

In the graph given, we can expect the x axis to be horizontal and the y axis to be vertical. This means that the arm span represents y and the height represents x.

Therefore, if a girl on her team is 63 inches tall, we can say that y=x+2, and since height is x, y = 63 + 2 = 65

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3 years ago
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