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nydimaria [60]
3 years ago
10

To conduct a survey about the type of phone service most people in Greenville prefer, 10 different blocks in the neighborhood ar

e chosen. On these 10 blocks, 10 houses are selected at random, and then one resident of each of those houses is interviewed. This type of sampling method is
Mathematics
2 answers:
Andrew [12]3 years ago
7 0

Answer:

The sampling method is stratified sampling.

Step-by-step explanation:

Stratified sampling is a method where the population is divided into groups and then from within each group a probable sample is selected.

Here, the groups the blocks. Then from each block, 10 houses are randomly selected and 1 person interviewed(probability sample).

Therefore, it is a stratified sampling.

algol133 years ago
5 0
This method is called cluster sampling. I hope it will work.
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Answer:

Top 3%: 4.934 cm

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Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

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Value of Z when Z has a pvalue of 1 - 0.03 = 0.97. So X when Z = 1.88.

Z = \frac{X - \mu}{\sigma}

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Bottom 3%

Value of Z when Z has a pvalue of 0.03. So X when Z = -1.88.

Z = \frac{X - \mu}{\sigma}

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X - 4.84 = 0.05*(-1.88)

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Answer:

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Step-by-step explanation:

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