Module 16 measurement basics Flashcards
Area =
1/2 (sum of the Bases) x height
This is the linear distance around an area or structure and is the sum of all the sides.
Perimeter
In the case of a circle, the perimeter is referred to as the
circumference, and the formula is C=πd, where
π = 3.141593 and d = diameter of the circle.
Area of a rectangle
area = length x width
Area of a triangle
Area = 1/2(base x height)
or
Base x Height
--------------------- = Area
2Area of a trapezoid
Area = 1/2 (Sum of the Bases) x Height
__________ are quadrilaterals that have two parallel sides and two non-parallel sides. A trapezoid is a four sided closed shape or figure which cover some area and also has its perimeter. The sides which are parallel to each other are termed the bases. The non-parallel sides are known as legs or lateal sides. The distance between the parallel sides is known as the altitutde.
Trapezoid
What are statistics?
A statistic is a single number that represents a group.
These are numbers that can be measured and compared with a certain degree of objectivity and precision.
Quantitative data
i.e., building size, acreage, parking spaces, building age
In contrast to quantitative data, we have data that is more subjective and often represented by words rater than numbers. _______
qualitative data
Qualitive data can be analyzed through ranking or by assigning numbers to qualitative terms. Terms such as excellent, good, average.
The complete set of all the items in a specific category. A population is also referred to as a universe.
Population
In statistics, a subset of a population selected for analysis.
Sample
In statistics, a characteristic or attribute of an item, service, or individual that can change from observation to observation.
Variable
The specific value of a variable is sometimes referred to as a
variate
Appraisers commonly use statistics to measure a ___________ in a group of numbers to determine if there is a pattern.
Central tendency
For example, a residential appraisal report form used by lenders asks for the predominant price and age of single-family housing that is located within the market area of the apprised property.
Mode=
most frequently occurring
Commonly referred to as an average
Mean
The _____ is a positional average; it’s the number in the middle
Median
To find the median,
it is first necessary to arrange the data in ascending or descending order; this is called an array. Then, count in an equal number from each end.
Formula for Median
n + 1
Md = ___________
2
Md= median n = number of variates in the data set.
Median number
2,3,4,5
Let’s work the formulat (four numbers + 1)
5 numbers divided by 2 is 2.5. The median is the number that lies between the second and third number. 3.5
Median number
What is bimodal distribution?
When there are two modes
The mean, median, and mode are measures of
Central tendency and tell us where numbers tend to cluster.
We can also examine measure of ______ which quantify the extent to which data vary from the average.
dispersion
The simplest measure of dispersion is the
range
This is the difference between the highest and lowest value in the data set.
range
You are asked to appraise a single-story dome home with a radius of 24 feet. What is the area of the home?
1,809 sq. ft.
Area of a circle is = π r²
π = 3.141593 and r = radius
