Kids & Baby size chart.
Error? No ... you didn't measure it wrong ... this is about accuracy. |
Measuring instruments are not exact!
Degree of Accuracy
Definition: A centimeter (symbol: cm) is a unit of length in the International System of Units (SI), the current form of the metric system. It is defined as 1/100 meters. History/origin: A centimeter is based on the SI unit meter, and as the prefix 'centi' indicates, is equal to one hundredth of a meter. Metric prefixes range from factors of 10-18 to 10 18 based on a decimal system. MacBreakZ is a sophisticated Personal Ergonomic Assistant designed to promote healthy and productive computer use. Download MacBreakZ 5.44. For Intel & Apple Silicon Macs running macOS 10.10 or later. Big Sur compatible. Download MacBreakZ 5.17.
Accuracy depends on the instrument you are measuring with. But as a general rule:
The degree of accuracy is half a unit each side of the unit of measure
Examples:
When your instrument measures in '1's then any value between 6½ and 7½ is measured as '7' |
When your instrument measures in '2's then any value between 7 and 9 is measured as '8' |
Notice that the arrow points to the same spot, but the measured values are different!
Plus or Minus
We can show the error using the 'Plus or Minus' sign: | ± |
When the value could be between 6½ and 7½: 7 ±0.5 The error is ±0.5 |
When the value could be between 7 and 9: 8 ±1 The error is ±1 |
Example: a fence is measured as 12.5 meters long, accurate to 0.1 of a meter
Accurate to 0.1 m means it could be up to 0.05 m either way:
Length = 12.5 ±0.05 m
So it could really be anywhere between 12.45 m and 12.55 m long.
Absolute, Relative and Percentage Error
The Absolute Error is the difference between the actual and measured value.But ... when measuring we don't know the actual value! So we use the maximum possible error.
In the example above the Absolute Error is 0.05 m
What happened to the ± ... ? Well, we just want the size (the absolute value) of the difference.
The Relative Error is the Absolute Error divided by the actual measurement.We don't know the actual measurement, so the best we can do is use the measured value:
Relative Error = Absolute ErrorMeasured Value
The Percentage Error is the Relative Error shown as a percentage (see Percentage Error).
Let us see them in an example:
Example: fence (continued)
Length = 12.5 ±0.05 m
So:
Absolute Error = 0.05 m
And:
Relative Error = 0.05 m12.5 m = 0.004
And:
Percentage Error = 0.4%
More examples:
Example: The thermometer measures to the nearest 2 degrees. The temperature was measured as 38° C
Macbreakz 5 34 Centimeters Equals
The temperature could be up to 1° either side of 38° (i.e. between 37° and 39°)
Temperature = 38 ±1°
So:
Absolute Error = 1°
And:
Relative Error = 1°38° = 0.0263...
And:
Percentage Error = 2.63...%
Example: You measure the plant to be 80 cm high (to the nearest cm)
This means you could be up to 0.5 cm wrong (the plant could be between 79.5 and 80.5 cm high)
Height = 80 ±0.5 cm
So:
Absolute Error = 0.5 cm
And:
Relative Error = 0.5 cm80 cm = 0.00625
And:
Percentage Error = 0.625%
Area
When working out areas you need to think about both the width and length ... they could possibly both be the smallest measure or both the largest.
Example: Alex measured the field to the nearest meter, and got a width of 6 m and a length of 8 m.
Measuring to the nearest meter means the true value could be up to half a meter smaller or larger.
The width (w) could be from 5.5m to 6.5m:
The length (l) could be from 7.5m to 8.5m:
7.5 ≤ l < 8.5
The area is width × length:
The smallest possible area is: 5.5m × 7.5m = 41.25 m2
The measured area is: 6m × 8m = 48 m2
And the largest possible area is: 6.5m × 8.5m = 55.25 m2
The measured area is: 6m × 8m = 48 m2
And the largest possible area is: 6.5m × 8.5m = 55.25 m2
41.25 ≤ A < 55.25
Absolute, Relative and Percentage Error
The only tricky thing here is ... which is the absolute error?
- From 41.25 to 48 = 6.75
- From 48 to 55.25 = 7.25
Answer: pick the biggest one! So:
Absolute Error = 7.25 m2
Relative Error = 7.25 m248 m2 = 0.151...
Percentage Error = 15.1%
(Which is not very accurate, is it?)
Volume
And volume has three measurements: width, length and height!
Each measurement could possibly be the smallest possible measure, or the largest.
Example: Sam measured the box to the nearest 2 cm, and got 24 cm × 24 cm × 20 cm
Measuring to the nearest 2 cm means the true value could be up to 1 cm smaller or larger.
The three measurements are:
- 24 ±1 cm
- 24 ±1 cm
- 20 ±1 cm
Volume is width × length × height:
The smallest possible Volume is: 23cm × 23cm × 19cm = 10051 cm3
The measured Volume is: 24cm × 24cm × 20cm = 11520 cm3
The largest possible Volume is: 25cm × 25cm × 21cm = 13125 cm3
The measured Volume is: 24cm × 24cm × 20cm = 11520 cm3
The largest possible Volume is: 25cm × 25cm × 21cm = 13125 cm3
And so we get:
10051 ≤ V < 13125
Absolute, Relative and Percentage Error
Absolute error:
- From 10051 to 11520 = 1469
- From 11520 to 13125 = 1605
Pick the biggest one:
Absolute Error = 1605 cm3
Relative Error = 1605 cm311520 cm3 = 0.139...
Percentage Error = 13.9%
MacBreakZ 5.44
Macbreakz 5 34 Centimeters =
MacBreakZ is a sophisticated Personal Ergonomic Assistant designed to promote healthy and productive computer use. Computer-related health problems ranging from eyestrain, headaches, neck, wrist, elbow and back pain to more severe Repetitive Strain Injuries (RSI), including carpal tunnel syndrome, writer's cramp, tendonitis, etc. are the result of inappropriate computer use. MacBreakZ offers a unique way of acquiring ergonomic skills that can save you a lot of discomfort and shield you from serious health and career-threatening injury.Macbreakz 5 34 Centimeters Meters
Show & Tell
The break reminder component of MacBreakZ features sophisticated keyboard and mouse monitoring (without invading your privacy*) that allows it to react to the way you are using your computer. What's more MacBreakZ provides you with instant feedback on how you are doing and thus lets you find out more about your work practices.
Suggest, Teach & Demonstrate
Based on your actual keyboard and mouse use and the time you have spent in front of the screen, MacBreakZ suggests rest and micro breaks at appropriate intervals. MacBreakZ includes a set of 42 fully illustrated stretching exercises that are designed to reduce muscular tension, improve posture and strengthen appropriate muscle groups. It also features dozens of great ergonomic tips.
Adapt
MacBreakZ adapts to how and where you work. A sophisticated setup assistant makes sure that you start off with a configuration that suits you and your workplace. An extensive array of preferences allow you to customize everything from how activity is measured to the way information is presented on the screen.
Tactful & Discreet
MacBreakZ isn't rude and just interrupts you in the middle of something important. Through its innovative interface using transparency and sound, it keeps you informed without stealing your focus and gives you plenty of warning before a break is due and even then respectfully waits until you have stopped working. You may of course also temporarily disable MacBreakZ for that all important presentation.
Serious Fun
Healthy computing does not have to feel 'medical'. MacBreakZ features a 'serious fun' interface that uses everything that Mac OS X has to offer from transparency effects to the sound interface. Lead artist, Nick Miller, also supplies a range of laid back stretching illustrations.
Plain Serious
MacBreakZ also features information displays and an illustration style that suit a more formal open plan office setting. A special 'stealth' mode encodes all essential information into a inconspicuous menu bar item for those who do not wish to broadcast the fact that they are using the product. You can even take your stretches with you anywhere by using our StretchZ for iPhone/ iPod touch.
What's New:
Version 5.44:- Late last year, making MacBreakZ 5 run natively on the new Apple Silicon M1 Macs meant that we had to update the third party keyboard shortcuts framework that we are using to much more recent version and that was causing trouble for some users.
- Development of our own framework, over which we have more control, is now finished and this version is the first of our tools to adopt it.
- We have also used this opportunity to update the code base and solve some minor bugs introduced in the M1 and Big Sur migrations.
Screenshots:
- Title: MacBreakZ 5.44
- Developer: Publicspace
- Compatibility: OS X 10.10 or later, 64-bit processor
- Language: English
- Includes: K'ed by TNT
- Size: 34.41 MB
- visit official website