How much of the Earth’s surface do deserts cover and where do they occur? What are the four major types of desert? (Site 1).

SAT

2 answers:

Citrus2011 [14]2 years ago

5 0

Answer:

Please give an Explanation:

VladimirAG [237]2 years ago

4 0

Answer:

The deserts present in the world cover 20 percent of the Earth's surface. Most of these deserts occur in the band of the areas present along the 30 degrees latitude in North and 30 degrees latitude in South. Some deserts are also located in the mountain regions. There are four major types of desert present across the world: 1. Hot and dry deserts 2. Semi-arid deserts 3. Cold deserts 4. Coastal deserts

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Explanation:

The symbol $\mu$ or mu represents the population mean, which is a parameter.

The symbol $\sigma$ or sigma represents the population standard deviation, which is also a parameter. The same goes for the symbol p, without any hat on top, as it is the population proportion.

If something represents a population data item, then it's automatically a parameter. It might help to think both words "population" and "parameter" start with the letter P.

Based on those previous paragraphs, we can rule out choices A, D and E. Those three items are parameters. This leaves <u>choices B and C</u> as our final answers.

$\overline{x}$ or xbar is a sample statistic, and it represents an estimate of the population mean. Similarly, $\hat{p}$ or p-hat is the sample proportion and it represents an estimate of the population proportion. These are considered unbiased estimators.

Another example of an unbiased estimator is the variable s which represents the sample standard deviation and it estimates the value of sigma. All of these estimators have one thing in common: they are based on a sample, which in turn tries to predict what the corresponding population value is. In other words, the statistic's job is to estimate the parameter.

Below is a reference table for all of the items mentioned.