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oksian1 [2.3K]
3 years ago
15

A store manager asks every 25th person to enter the store which sales they like the best. Which type of data collection method i

s described in this situation?
A. observational study
B. experiment
C. sample survey
D. None of the choices are correct
Mathematics
1 answer:
Makovka662 [10]3 years ago
4 0

Answer:

D. None of the choices are correct.

Step-by-step explanation:

Systematic sampling refers to a method of random sampling during which sample members are extracted from a larger population and then collecting corresponding observations using a constant interval between samples taken. This interval, called the sampling interval, is measured by deducting the size of the population by the required sample size. As per the question, the store manager asks every 25th person about the sales which is a classic example of systematic sampling.

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And replacing we got:

E(Y) =0*0.60 +1*0.25 +2*0.1 +3*0.05 = 0.60

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P(Y) 0.60 0.25  0.10  0.05

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We can find the expected value with this formula:

E(Y) = \sum_{i=1}^n Y_i P(Y_i)

And replacing we got:

E(Y) =0*0.60 +1*0.25 +2*0.1 +3*0.05 = 0.60

Part b

If we want to find the expected value of 100 Y^2 we need to find the expected value of Y^2 and we have:

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And replacing we got:

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And then the expected value would be:

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