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You look at real estate ads for houses in Naples, Florida. There are many houses ranging from \(\$ 200,000\) to \(\$ 500,000\) in price. The few houses on the water, however, have prices up to \(\$ 15\) million. The distribution of house prices will be (a) skewed to the left. (b) roughly symmetric. (c) skewed to the right. (d) unimodal. (e) too high.

Short Answer

Expert verified
(c) skewed to the right.

Step by step solution

01

Understanding skewness

Skewness refers to the asymmetry in the distribution of data. If a distribution is skewed to the right (or positively skewed), the majority of the data falls to the left with a long right tail. If a distribution is skewed to the left (or negatively skewed), the majority of the data falls to the right with a long left tail.
02

Identify the majority of data points

In this scenario, most houses are priced between \(\\(200,000\) and \(\\)500,000\). This means most of the data points cluster at the lower end of the price range.
03

Consider the presence of extreme values

The few houses on the water have significantly higher prices, up to \(\$15\) million. These are far higher than the majority of prices, creating extreme high values on the right end.
04

Determine the direction of skewness

Since there are houses with prices much higher than the typical range, the distribution will have a long tail on the right. This indicates a distribution that is skewed to the right.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Distribution Asymmetry
In statistics, distribution asymmetry refers to how data is distributed in relation to a central point, typically the mean. When distribution is asymmetrical, it means that the data is not evenly distributed on either side of this central point. A perfectly symmetrical distribution would look like a mirror image on both sides of the mean, with equal tails. However, in practical scenarios, data often does not follow such perfect symmetry.

There are two primary types of asymmetrical distributions:
  • Right Skewed: Also known as positively skewed, where the majority of the data points fall towards the left side of the mean. In this scenario, there is a longer tail on the right side. This is common in situations like income distribution, where there are a few very high values compared to more common lower values.
  • Left Skewed: Also called negatively skewed, where most data points cluster on the right side of the mean and the tail is longer on the left.
Understanding distribution asymmetry helps in analyzing data patterns and summarizing data effectively.
Real Estate Prices Distribution
The distribution of real estate prices, particularly in diverse markets, can exhibit distinct patterns. Prices often reflect a combination of typical market values and outliers. In real estate markets, most houses may be priced within a similar range, creating a peak where most data points lie. However, certain unique factors, such as location – for instance, waterfront properties – can cause significant deviations from this cluster.

Consider a scenario in a region like Naples, Florida, where real estate prices mostly range from \(\\(200,000\) to \(\\)500,000\). This range forms the central concentration of data points in this distribution. However, luxury homes, particularly those on the water, may cost significantly more, potentially up to millions of dollars. These high-value properties create outliers that stretch the distribution.

This variation implies that while the majority of properties maintain lower prices, the inclusion of a few extremely high-value houses results in a pronounced tail on the distribution graph. Effective interpretation of such a distribution is critical for making informed business, investment, or policy decisions in the real estate market.
Right Skewed Distribution
A right-skewed distribution is one where the bulk of the data points pile up on the left, while fewer points stretch out toward the right, creating a long tail. This is a common occurrence in real-world datasets, including real estate prices, income distribution, and certain biological measurements.

In a right-skewed distribution:
  • There are fewer high-value outliers compared to the lower-values, which tend to be more densely packed near the mean.
  • The mean is usually greater than the median because of the influence of high-value outliers pulling it to right.
  • The tail of the distribution curves more towards the right, representing those uncommon high values.
This type of skewness often requires specific statistical methods for analysis, since traditional assumptions of symmetrical data may not hold. It is important to recognize right skewed distributions for proper data interpretation and to make informed decisions based on that data. This understanding helps in scenarios like pricing strategies, budget planning, and economic forecasting.

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Most popular questions from this chapter

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