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Archive | GRE Data Analysis

GRE Math: What’s the Difference Between Combination and Permutation?

Do you know the difference between permutation and combination? No? You’re not alone. Combinations and permutations are the bane of many students. Yet, what I’ve noticed over the years is it’s not so much both of them that are the issue as it is which one to use for a particular problem: the combination vs […]

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FAQ: Should I Study Probability?

I have 30 days to the test and am terrified about probability…what should I do? There is perhaps no other topic on the GRE math that instills as much dread in students as does probability. Understandably, students will obsess over this topic more than they will other topics. However, such an approach won’t only lead […]

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Does Order Matter? Combinations vs. the Fundamental Counting Principle on the GRE

When trying to decide whether to use the combination formula, many students have trouble applying the “does order matter” test–deciding if outcomes differ. It’s easy to say order doesn’t matter when it in fact does, and vice versa. Once you get it, it’s really useful, but it can take a bit of thinking and re-thinking. […]

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GRE Math: Histograms

First, a practice question about the following scenario. In a survey, 86 high school students were randomly selected and asked how many hours of television they had watched in the previous week.  The histogram below displays their answers.     1)   Histogram First, a reminder on histograms.  Histograms are not simple bar or column […]

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Best Fit Lines in GRE Data Interpretation

One category of graph you certainly could see on GRE Data Interpretation questions is the scatterplot, and its associated idea of the best fit line. Let’s talk about how these beasts operate! Scatterplots To begin, let’s review scatterplots.  When each data point (each person, each car, each company, etc.) gives you a value for two […]

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Standard Deviation on the New GRE

Many quake in their boots when they hear that there will be Statistics covered on the GRE. They run to their college stats textbooks, dust off the cover, roll up their sleeves, and start computing the standard deviations of a list of twenty, three-digit numbers. Stop, if this in anyway describes you. The Statistics on […]

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