Whether you are a student looking for practice questions for an upcoming exam, a parent seeking a math tutor for his/her 5th grade child, or a tutor who is searching for resources to help students improve their SAT vocabulary, you would be relieved to find that relevant information is readily available to you every step of the way. And all of this is made possible because of dedicated individuals who have built powerful search engines, highly-accessible websites, and well-architected databases; filled them with data collected from various sources; and organized them into the useful pieces of information that can be provided to all of the users.
While data has been around us every second of our daily lives, organizing them into useful information is as much of a science as any chemical combustions that you may have pondered over. Whether you are a student looking for practice questions for an upcoming exam, a parent seeking a math tutor for his/her...
We all want things to last. People always got photo albums handed down to them. With everything being digital and possibly cloud-based, what is there to actually "hand down?" Just ones and zeroes. The data itself needs to be archived.
Archiving is permanent storage for safety and posterity, as opposed to backups which are for safety and short-term storage. When I say short-term, I mean a single person's lifetime. What then? The data gets bequeathed and downloaded to the next person, while storage formats and devices constantly change? Do we just think the "cloud" is everlasting? Where's the
real permanence? Data would last much longer stored on paper than on any kind of tape, hard disk or flash based devices we have today.
Only optical discs offer that kind of potential timescale for storing digital data. While it's true CD-Rs don't hold a lot of data (less than 700MB), the formulations that use gold are as permanent a storage...
The general form for a box-and-whisker plot is really easy. Let's take a simple data set.
8.2, 15.9, 12.8, 7.4, 24.7, 23.2, 9.6, 7.9, 8.3, 10.2
First, we need to take those data and put them in numerical order. When we do that, this is what the data set looks like:
7.4, 7.9, 8.2, 8.3, 9.6, 10.2, 12.8, 15.9, 23.2, 24.7
[Note: Any computer program that runs spreadsheets or statistical analysis will probably accept the data in any sequence. Ordering the data is only necessary when doing this process by hand.]
Once ordered, we need to find the median of the set. The median means the "middle" value. In this case, the set has 10 values, so there's no singular "middle" value of the set when ordered least to greatest. To create one, we'll take the two middle values and average them.
(9.6 + 10.2)/2 = 9.9
[The only reason we took an average is because there is not "middle"...