Archive for the 'Students' Category

Free SAT Prep Resources

Tuesday, November 13th, 2007

Let’s say you’re planning to take the SAT Reasoning Test. If you’re a college-bound student in the United States, chances are good that you’ll either be taking this test or the ACT (or both) in order to get into college. This is a fairly high-stakes test. It’s only offered a few times per year, and due to college application deadlines, most students only have a couple opportunities to take it. Add to this the fact that it costs $43 to take the test, and that it’s given on a Saturday morning, and you’re going to want to do as well as you can the first time you take it.

proprofs.jpgSo how do you prepare? Well, you could buy an SAT Prep book. There are lots of titles to choose from, each offering the “best” advice on preparing for the test. You could take a class online. Kaplan offers one for $399. For a mere $70, you can take an online course from the College Board, which administers the test. If you’re a student in my district, you can take a before-school class for $50 that will help you get ready for the test.

Or, there’s an alternative. ProProfs.Com offers a wealth of SAT test-prep materials for free. The site offers practice tests, study guides, flash cards, quizzes, and test-taking tips for best performance. The site also offers some videos, but they’re mostly embedded YouTube videos, so access to these resources may be limited in schools.

In addition to the resources provided, the site allows teachers and students to contribute by making their own quizzes and editing the wiki. This allows students to share their successful strategies with others.

In addition to the SAT prep resources, the site also has study aides for the CompTIA, Cisco, and Microsoft certification programs. They’re also working on resources for the ACT, GRE, GMAT, and several other high-stakes tests.

Problem Number Three

Wednesday, November 7th, 2007

I’ve heard Will Richardson speak a number of times, including twice last month. In his keynote addresses, he usually includes this:

We have to figure out who we can trust. We can’t have our kids simply looking at something and accepting it. I know many of you have seen this. Martinlutherking.org. This is the stump site for people talking about information literacy. For those of you who haven’t seen it, it comes up in the top results on the Google search when you search for Dr. King. It looks like a pretty decent site. “Attention students. Try out MKL Pop quiz.” They’re marketing this to kids. “Death of the dream.” “Civil rights library.” It looks pretty good until you read over on the right where it says “That night King retired to his room at the Willard Hotel. There, FBI bugs reportedly picked up 14 hours of party chatter, the clinking of glasses and the sounds of illicit sex — including King’s cries of ‘I’m F-ing for God’ and ‘I’m not a Negro tonight!’.”

Now if our kids are doing research on Dr. King and they come to this site and they read that and a little bell doesn’t go off in their brains that something is not quite right with this page, that’s problem number one. If the bell does go off in their brains and they say “that doesn’t sound like something really accurate” but they don’t know how to figure out who owns this site and what the motives of the people who own this site are, that’s problem number two. And the biggest problem of all is if I gave you the quiz right now, and I said you have a minute to figure out who owns this site and what the motivations of those people are, that’s a huge problem if you cannot pass that quiz. Because, guess what. In this world, if you can’t do that, you are illiterate. Because that means anybody can tell you anything at any time.

Will Richardson picture from http://umanitoba.ca/learning_technologies/connectivisim/bio_will.phpThis particular quote is from Bob Sprankle’s recording of Will’s talk at ACTEM07. I’ve also excerpted this section so you can listen for yourself.

 
icon for podpress  Will Richardson at ACTEM (excerpt) [1:32m]: Play Now | Play in Popup | Download

In this example, you can scroll down to the bottom of the page, and find the “Hosted by Stormfront” link. I didn’t link to either page, because I don’t want to do anything that would improve their Google results. Clicking on the Stormfront link at the bottom of the page will give you a pretty clear picture of the motives behind the website. But what if it’s not that easy?

I’m going to pick on the Hudson City Schools for a minute. This is a school district in northeast Ohio. In the interest of full disclosure, I should point out that I used to work there, and I’m friends with their technology coordinator. But there are a couple red flags that come up when you go to their web site. The first of these is that they use “hudson.edu” as their domain name. Normally, “.edu” is reserved for a college or university. Most K-12 schools in Ohio use something like “hudson.k12.oh.us.” So how do I know that this “.edu” site is the real site for the school and not just some prank hosted by a disgruntled former student at a university somewhere?

One thing I can do is look up the organization that controls the domain name. If I go to whois.net, for example, I can search for “hudson.edu,” and it tells me it’s registered to Hudson High School. It gives the name and contact information for the person responsible for the domain name, and it includes the valid street address and phone number of the school.

Let’s try another one. What about “tasteoftech.net?” That’s registered to me, and a whois search confirms that. How about “bbhcsd.org?” That looks like the official site for the Brecksville-Broadview Heights schools, but the “.org” makes me suspicious. It lists valid contact information for me, as well as the school’s name and address. You’ll also note that “www.bbhcsd.k12.oh.us,” a web address that more closely follows the convention used by Ohio schools, also goes to the same place.

GenochoiceLet’s look at one that looks a little less plausible. Genochoice offers prospective parents the ability to genetically engineer their children. Using sophisticated probes and DNA amplifiers, they can identify genes that predispose people to Alzheimer’s, heart disease, cancer, obesity, and dyslexia. By eliminating these genes at the pre-embroyonic stage, they can decrease the risk of these babies developing those types of conditions later in life. The page is very professional-looking, and the site appears to be affiliated with RYT Hospital. Whois lookups on these sites reveal the fact that their owners’ identities are being protected by the domain name registrar. This has become a common practice now. It doesn’t necessarily indicate a problem, but it also doesn’t vindicate the sites.

Looking closely at the site, you see a couple things that give it away. The “credits” page, for example, explains that the site was created by artist Virgil Wong. Then there are the links to the “male pregnancy” site and the Glyven project, which simultaneously cured Alzheimer’s while giving a mouse the intelligence of a human. But you might miss those at first glance.

How do we teach this stuff? Back in high school, my American History teacher taught us to always consider the source of information we read. This is the class where we spent six weeks digging through primary sources about the battle of Lexington and Concord. People write things from their own points of view to justify their own actions, decisions, and opinions. Two eyewitness accounts of the same event will often differ, because the witnesses report things from their own frames of reference. Without knowing anything about the author of something on the web, then, it’s difficult to establish its credibility. The Genochoice site is an artistic work that can be misinterpreted as a real medical site. It’s not beyond the realm of possibility that there would be a fake school site online somewhere. Whitehouse.net (and .org and .com, and, to be honest, .gov) are all run by people with political axes to grind.

Ironically, this may be a case where sites like Wikipedia become more credible. A collaboratively written document is vetted by a number of people with different points of view. The likelihood that it represents a single perspective diminishes as more people contribute to it.

How do we solve the third problem? I’m not sure we can. But the first first step is to be skeptical. Challenge the assumptions. Make the sites prove their credibility. Don’t believe everything you read. Use your 21st century information literacy skills.

Paste Special

Thursday, October 25th, 2007

A couple weeks ago, I mentioned that I needed to write about this. When you want to copy things from one place to another on the computer, copy/paste is a common way to get that done. I can copy some text out of an email and paste it into a Word document. Or I can copy some text from a web page and paste it into an email.

Paste SpecialBut what if I don’t want an exact copy? Maybe the email message is using Verdana as the font, and my Word document is in boring old Times New Roman. Or maybe that web page has blue text. I don’t want that in my email message.

This is where Paste Special comes in handy.  Depending on the program and the type of data, paste special will give you some different options. In Microsoft Word, for example, I frequently use “unformatted text”. This pastes the text without the formatting.  If you’ve ever pasted something from a web page, and then struggled to get the formatting to match the rest of your document, this is what you needed.

In Excel, I use paste special when I want to separate the data from the formulas that generated it. I copy the cells I want, and then use paste special, selecting “values.” This replaces the formula in each cell with the data generated by the formula. It’s especially useful when working with data from multiple sources to generate a single spreadsheet. By doing this, we don’t have to worry about keeping the connections between those files intact.

When I taught middle school, I caught a lot of kids plagiarizing text from the Internet because the fonts and text sizes didn’t match the rest of the document. If they had known about paste special, I would have had to actually do a web search to catch them. :-)

Natural Selection

Wednesday, October 3rd, 2007

I’ve been playing with this all week. Go over to Mutating Pictures. You’ll see a computer-generated image. Rate how much (on a scale of 0-10) the image looks like a face. The system “learns” from the ratings people give it, and over time, the images improve.

I’ve just seen a faceWhat’s really going on? Philipp Lenssen started with 1000 random images. These images produce “offspring” with mutations. Initially, up to 15% of the image changed with each generation, though he has reduced that number as the site has gained popularity. As people rate the images, higher ratings extend the life of the image and allow it to produce more offspring. Lower ratings kill off the images. Over time, the images that are selected look more like faces, and the entire site “evolves.” In the discussion, Philipp explains more about the algorithm behind the experiment.

I told Darrell about this. “So we’re a subset of the infinite monkeys?” he asked.

“Not really. We’re the people reading what they’re typing. We then decide which monkeys should be allowed to reproduce, and which should be killed off.” While there’s no Shakespeare yet, we may be at the point of tabloids already, or even bad blogs. That’s pretty amazing.

Within the first day, all of the 1000 original images were killed off, and the average image was lasting 58 minutes. Yesterday, there were more than 71,000 hits on the site.

Recently, Philipp added two new sets of images to the pool. A second set of faces is currently evolving from the same originals, to see if they end up looking like the first set. At the same time, a new set of pictures is being used to produce an “animal.” He left the name ambiguous on purpose to see what develops. You can also see the progress by comparing a sample of the original pictures with the current generation.

No monkeys were harmed during the creation of this blog post.

Validating Wikipedia

Friday, September 21st, 2007

The main criticism of Wikipedia is that anyone can edit it. I don’t know the first thing about the Napoleonic wars. But I can go to the Wikipedia article and edit the entry and act like I was there. I can change anything I want. When I save it, it looks just like the rest of the information on Wikipedia. But it’s not accurate.

Wikipedia LogoA few weeks ago, WikiScanner was all the rage.  When you edit Wikipedia anonymously, it records your IP address. That IP address is assigned to the organization from whom you get your Internet access. So people can do reverse lookups on the ip addresses of Wikipedia authors, and find out who their Internet providers are. Who cares, you may ask. Well, as it turns out, sometimes you can get a lot of information about an editor by knowing how they’re connecting to the Internet. What if your Internet provider is, say, Proctor & Gamble? Chances are, you work there. What if it’s the U.S. Senate? Same thing. And what if people in these organizations are editing the wikipedia entries about their respective products, people, or issues? We then have biased data that’s not easily attributed with its source.

WikiScanner allows you to search for an organization. It then looks to see which IP addresses are assigned to that organization. Then, it checks to see which pages in Wikipedia have been edited by those IP addresses. Pretty cool.

Another technology that’s helping to assert the quality of Wikipedia articles is the Wikipedia Trust Coloring project from the UCSC Wiki Lab.  While this is only currently available as a demo, the idea is pretty neat. The text in Wikipedia articles is color-coded based on its stability. So text that doesn’t change much is the normal black color. Selections that change frequently, or are edited by people who haven’t contributed much to Wikipedia, are color-coded orange. The darker the orange, the more suspicious the information.

Last week, Alvin wrote about Scholarpedia.  This tool overcomes the credibility problem by only publishing items that are peer-reviewed by scholars knowlegeable in the subject. Because of the significant requirements to be approved to edit an article, there’s not nearly as much information in Scholarpedia as there is in Wikipedia. But you can bet it’s a lot more accurate.