Finished this short but informative book in 2 days. Steve Krugs gives advice on avoiding common usabilities issues.
With that, here are a few things I picked up.
– Test rather than argue with your team.
– Users read in a hurry, so kill the noise by having less design and small talk, while filling the page up with unique content.
– Avoiding ads on your home page, even though it has the highest traffic.
– Provide aid for lost users. That includes a way to get to the home page, a site id, and other means of understanding their location.
– Test each stage of your project at least once. The earlier the testing, the cheaper to repair.
Hey Everyone,
I’ve been working hard to push out a great example of the potential jquizme has to offer to learning.
“Learn Those Kana”, demonstrate the true power of scripting, by providing plenty of exercise for mastering character recognition by sight and sound.
Anyhow check it out at at the link below.
How to place your answer in sig figs after arithmetic.
What are sig figs?
Simply put, sig figs is the degree of reliability for a measurement. Calculations done on a measurement are as accurate as the least reliable measurement. You will encounter sig figs in chemistry, when dealing with atomic structures, and molecular. It’s worth noting that Sig Figs are commonly called Significant Figures, or Significant Digits. But I prefer Sig Figs.
The fastest way to finding sig figs.
The traditional way of teaching sig figs contains too many conditions. List of rules here. So, I found a way to simplify the approach into the following statement.
Sig figs are the number of digits from the “first nonzero” to the “last position”.
The “Last Position” is the last number’s position if the measurement has a decimal. Otherwise, the “Last Position” is the last non-zero’s position.
The “First NonZero” is the position of the first non-zero.
Another way of writing this is below. Number of sig figs = ( “Last Position” – “First NonZero” ) + 1 NOTE: If the measurement is defined, then all the numbers are sig figs.
Now let’s do a few examples.
Note that “method 1” is done by counting. While method 2 is done by using the algorithm.
Question 1: 1200 has how many sig figs?
Answer: 2 sig figs.
Method 1: The first is 1, and the last is 2. There are two digts from digit 1 to digit 2. Therefore 2 sig figs.
Method 2: ( “Last Position” – “First NonZero” ) + 1 ) = (2 – 1) + 1 = 1 + 1 = 2 sig figs
Question 2: 1200.25 has how many sig figs?
Answer: 6 sig figs
Method 1: The first is digit 1 and the last is digit 5 because there is a decimal. There are 6 digits from 1 to 5. Therefore 6 sig figs.
Method 2: ( “Last Position” – “First NonZero” ) + 1 ) = (6 – 1) + 1 = 5 + 1 = 6 sig figs
Question 3: 0.0025 has how many sig figs?
Answer: 2 sig figs
Method 1: The first is digit 2 and the last is digit 5. There are 2 digits from 2-5. Therefore 2 sig figs.
Method 2: ( “Last Position” – “First NonZero” ) + 1 ) = (5 – 4) + 1 = 1 + 1 = 2 sig figs
Question 4: 1.0010 has how many sig figs?
Answer: 5 sig figs.
Operations then sig figs:
When multiplying and dividing measurements, the result must have the same sig figs as the term with the least. However, you should ignore sig figs for unitless numbers.
When adding and subtracting, the result must have the same number of decimal places as the term with the least.
Example:
Question 5: What is the average of 130 in and 122.14 in
Answer: 76 in
Average is sum of the terms divided by 2.
130 in + 122.14 in = 152.14, only worry about sig figs after your calculation are done.
152 in / 2 = 76 in. 2 is unit-less, so you should consider sig figs in this operation.
Question 6: What is the 8,000 ft / 20 ft
Answer: 4 x 103
8,000 ft / 20 ft = 4 x 103. Not 400 because you must use the sig figs from the term with the least.
That concludes this tutorial.
Like always I appreciate feedback.
