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<p>I guess you should listen to Latency here (with emphasis on the word understand). Although I still think it didn’t show up, I took the test far too long ago ('07) to remember accurately. </p>
<p>Since magiscoder brought it up earlier, I thought it would be worth mentioning to make sure you don’t just use the calculator and get Sx confused with sigma_x. </p>
<p>Sx is the “sample standard deviation”. Basically, when you use a sample (subset) of a population to make an inference about the true standard deviation of the entire population, Sx takes into account an adjustment factor (although it’s not perfect per se). Known as Bessel’s correction, it involves dividing by “n-1” instead of “n” in the definition of standard deviation that you should know. </p>
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<p>That is so not the point. Mathematics is all about thought. Think about it like this: You are a bright young student wanting to go to college. Any idiot can be taught how to press some buttons on a calculator and get an answer right. What separates you from him/her?
Answer: intellectual curiosity</p>