IB Design Technology Topic A1.1.3 Percentiles in Design Revision Notes (SL/HL)

IB Design Technology Topic A1.1.3 Percentiles in Design Revision Notes (SL/HL) | RevisionDojo

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Percentiles: Which Part of the Population a Measurement Describes

Anthropometric data (from A1.1.2) is only useful once a designer can say which part of the population a measurement describes.
A percentile sorts a population into 100 equal groups by a single dimension, such as standing height or grip reach.

Definition

Percentile

A percentile is a value that shows how a data point compares to the rest of the data, dividing the set into 100 equal parts.

Reading a Percentile

A person at the 70th percentile for height is as tall as, or taller than, 70% of the sampled population.
Only 30% of that sample are taller.
The 50th percentile is the mean, the most likely value, and the point most anthropometric tables place at their centre.
Tables usually list each dimension at the 5th, 50th, and 95th percentiles, enough to describe the small, average, and large user at once.

The Bell Curve and Standard Deviation

Sample a large population and the measurements form a normal distribution, the familiar bell curve, with most people near the mean and fewer towards each extreme.
The spread of that curve is the standard deviation, written as the Greek letter sigma.
About 68% of people fall within one standard deviation of the mean, and about 95% within two.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

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Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Percentiles: Which Part of the Population a Measurement Describes

Anthropometric data (from A1.1.2) is only useful once a designer can say which part of the population a measurement describes.
A percentile sorts a population into 100 equal groups by a single dimension, such as standing height or grip reach.

Definition

Percentile

A percentile is a value that shows how a data point compares to the rest of the data, dividing the set into 100 equal parts.

Reading a Percentile

A person at the 70th percentile for height is as tall as, or taller than, 70% of the sampled population.
Only 30% of that sample are taller.
The 50th percentile is the mean, the most likely value, and the point most anthropometric tables place at their centre.
Tables usually list each dimension at the 5th, 50th, and 95th percentiles, enough to describe the small, average, and large user at once.

The Bell Curve and Standard Deviation

Sample a large population and the measurements form a normal distribution, the familiar bell curve, with most people near the mean and fewer towards each extreme.
The spread of that curve is the standard deviation, written as the Greek letter sigma.
About 68% of people fall within one standard deviation of the mean, and about 95% within two.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A. Design in theory8 subtopics

B. Design in practice8 subtopics

C. Design in context8 subtopics

IB Design Technology Topic A1.1.3: Percentiles in Design Notes

A. Design in theory8 subtopics

B. Design in practice8 subtopics

C. Design in context8 subtopics

Percentiles: Which Part of the Population a Measurement Describes

Reading a Percentile

The Bell Curve and Standard Deviation

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Percentiles: Which Part of the Population a Measurement Describes

Reading a Percentile

The Bell Curve and Standard Deviation

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account