#xstat231 - Twitter Hashtag

Professor X @StatProfX

over 6 years ago

Also, seriously... read all the instructions in the front of your final exam #xstat101 #xstat231 #NotASubtleHint

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Professor X @StatProfX

over 6 years ago

If there are any #xstat231 students out there, I haven't forgotten you. Remember, although the #'s for a Z and t test-stat are near identical, there's a good chance that if you FTR using the t-dist'n you may erroneously reject using the z-dist'n, risking a Type I error.

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Professor X @StatProfX

almost 7 years ago

Oh yeah, and percentiles are our friends. Remember: P(X < c) = 0.75 means we are looking for some value "c" that gives us a probability of 75%, which is also known as the 75th percentile since 75% is◀️ and 25% is▶️of "c". #NotASubtleHint #ExamTime #xstat101 #xstat231

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Professor X @StatProfX

almost 7 years ago

If you are looking for a hint for your midterm 2 tomorrow, then know that the Central Limit Theorem is the (literal) answer. #NotASubtleHint #ExamTime #xStat101 #xStat231

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Professor X @StatProfX

almost 7 years ago

Although the median is the middle number, there is no guarantee it’s in the middle of a histogram #xstat231 #NotASubtleHint #TestTime

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Professor X @StatProfX

almost 7 years ago

A great thing about the empirical rule is that it tells us a lot about where the data lies the likelihood of seeing it, e.g. 95% falls within 2SD, then we expect 5% outside of 2SD AND because of symmetry, we expect approx. 2.5% is 2SD above the mean #xstat231 #xstat101

StatProfX's tweet photo. A great thing about the empirical rule is that it tells us a lot about where the data lies the likelihood of seeing it, e.g. 95% falls within 2SD, then we expect 5% outside of 2SD AND because of symmetry, we expect approx. 2.5% is 2SD above the mean #xstat231 #xstat101 https://t.co/SdoLX1NcG9

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Professor X @StatProfX

almost 8 years ago

Let A = {Know formula #2 for SD for quiz #2}, then P(A) = 100% #xstat101 #xstat231 #ExamTime #NotASubtleHint

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Professor X @StatProfX

almost 8 years ago

Gonna give a hint to any #xstat231 students who might see this, although the probability may be low: Know how to do the example on pg. 10 (last lecture) for the quiz #StatsLife #ExamTime

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