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viva [34]
2 years ago
8

(08.01 mc) sue wants to know how many families in her small neighborhood of 50 homes would volunteer to help at a neighborhood a

nimal shelter. she put all the addresses in a bag and drew a random sample of 25 addresses. she then asked those families if they would volunteer to help at the shelter. she found that 18% of the families would volunteer to help at the shelter. she claims that 18% of the neighborhood families would be expected to help at the animal shelter. is this a valid inference?
Mathematics
1 answer:
Pani-rosa [81]2 years ago
4 0

Answer:

Yes, this is a valid inference because she took a random sample of the neighborhood.

Step-by-step explanation:

As we can see, Sue's survey was perfectly random and without any prejudice.

18% of the families, according to her research, would volunteer at the shelter. According to her, 18% of the local households should be required to volunteer at the animal shelter.

Therefore, given that she chose a representative sample of the area, her conclusion is valid.

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3 years ago
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Answer:

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Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean = 266

Standard deviation = 16

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3 years ago
Subjects for the next presidential election poll are contacted using telephone numbers in which the last four digits are randoml
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Now , the probability that for one such phone​ number, the last four digits include at least one 0. = 1- P(none of them is 0)

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Hence, the probability that for one such phone​ number, the last four digits include at least one 0. is 0.3439 .

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Step-by-step explanation:

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