700 does not equal 70% - from borntolearn

Finkenstein · Aug 11, 2009

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I thought that this was pretty interesting:

Source.. http://borntolearn.mslearn.net/2009/08/the-truth-about-scoring-700-does-not-equal-70

The Truth About Scoring: 700 Does NOT Equal 70%

I know…it’s been a while since you’ve heard from me. You’re probably wondering what happened to me. I don’t know exactly. I could venture a guess, but it would only sound like a rationalization. (For those of you who have been paying attention, that’s a line from one of my favorite movies. Anyone?)

Now, that I’m back, let’s talk about something that’s near and dear to your heart and mine-scoring. It is my mission to correct a common misperception about our scores…700 is not equal to 70%. Let me explain.

All MCP exam scores are scaled. This process converts the number of points that you earned on the exam-in most cases, this is equivalent to the number of questions that you answered correctly (this is called a “raw score”) to a common scale that in Microsoft’s case ranges from 0-1000. Scaling scores makes it easier to compare scores from one administration to the next. When we make changes to our exams, the raw cut score (and percent of items that you must answer correctly in order to pass) changes because the cut score is based on the difficulty of the content on the new version of the exam. With scaled scores, you can compare your performance across retakes; if we provided raw scores or percentages, it would be very difficult for you to know if your performance had improved from one attempt to the next if we had made a change to the exam between your attempts.

As an added benefit, scaling scores makes it much easier for us to communicate the passing score for our exams-a score of 700 is required to pass any MCP exam. I have to manage ~125 live exams, and if someone asks me what the passing score is for a particular exam, a common cut score across all our exams simplifies things. What’s the cut score for 298? 700. 350? 700. 640? 700. 680? 700. By the way, scaling scores is not unique to Microsoft; most certifying organizations provide scaled scores rather than raw scores for these reasons.

Here’s the key that bears repeating-700 is not equal to 70%. I hear this a lot… I need to answer 70% of the questions correctly to pass the exam. This is not true; in fact the actual percentage of items that you have to answer correctly varies for exam to exam and can range from roughly 50% to 85%. I can’t tell you what the range is exactly for our exams or what the cut score percentage is for a specific exam, but I can tell you that it varies-on some exams you need to answer a higher percentage of items correctly to pass than you need to on other exams. The cut score for a particular exam is based on input from SMEs, the minimum qualifications for competency, and the difficulty of the item pool. Carrying this one step further, this also means that the score that you see in the score report is not the percentage of items that you answered correctly (unless you answered all the questions correct (1000=100%) or incorrect (0=0%), but these are the only exceptions). It’s simply an indication of your performance in relation to the cut score.

Are you sensing that this is a pet peeve of mine? Why do I care so much? I care because Microsoft doesn’t arbitrarily decide what the cut score should be on an exam. We set the cut score based on input from SMEs who help us determine the point at which minimal competency is demonstrated given the target audience for the exam. Every step of the exam development process is driven by SME input; nothing is done arbitrarily, including setting the cut score.

Now, I’ll step off my soap box. What else do you want to know about how we set the cut score or report scores? Ask away. And, for those of you who recognize the movie quote from the first paragraph, you’ll earn my respect (which is actually a modified version of a line from a different movie).
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BosonMichael · Aug 11, 2009

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The truth is out! Repped!

daft_togger · Aug 11, 2009

Would it be from any of these by any chance ? - The Office, Ghost Hunters, Shaun of the Dead, Hot Fuzz, Snatch, The Munsters, Star Wars, Usual Suspects, Reservoir Dogs.........sounds like a line from Starwars to me ?

BosonMichael · Aug 11, 2009

daft_togger said: ↑

Would it be from any of these by any chance ? - The Office, Ghost Hunters, Shaun of the Dead, Hot Fuzz, Snatch, The Munsters, Star Wars, Usual Suspects, Reservoir Dogs.........sounds like a line from Starwars to me ?
Click to expand...

You'll have to ask Liberty Munson (at the link) for the answer to that question!

Arroryn · Aug 11, 2009

daft_togger said: ↑

Would it be from any of these by any chance ? - The Office, Ghost Hunters, Shaun of the Dead, Hot Fuzz, Snatch, The Munsters, Star Wars, Usual Suspects, Reservoir Dogs.........sounds like a line from Starwars to me ?
Click to expand...

Quoting all the movies from his favs in his profile is cheating

Finkenstein · Aug 11, 2009

Mike is right guys, sorry. It wasn't my favorite movie quote, but the original poster's. I just copy and pasted.

If you guys don't currently visit borntolearn.com, I highly recommend it as it often will provide excellent insight to the certification world. I like to check it every few weeks myself.

Thanks too to Mike for the rep!

daft_togger · Aug 11, 2009

Arroryn said: ↑

Quoting all the movies from his favs in his profile is cheating
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I know I know, but I was struggling..........I'll get my coat......

Finkenstein · Aug 12, 2009

daft_togger said: ↑

I know I know, but I was struggling..........I'll get my coat......
Click to expand...

Nah, stick around... it makes for good conversation.

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