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DS4PS / cpp-523-fall-2020

http://ds4ps.org/cpp-523-fall-2020/
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Exam Review with Solutions <> Practice Exam #19

Open karinalungo opened 4 years ago

karinalungo commented 4 years ago

I completed the Practice Exam and wanted to check my answers but the Exam Review with Solutions has a whole set of new questions that do not match with the Practice Exam. Is this on purpose?

I would in particular like some guidance to question 10 on the Practice Exam: Multiple Regression Results on Channel Satisfaction. The largest level of confidence to chose for the confidence interval around the slope. Any guidance is welcome. Thank you.

Schlinkert commented 4 years ago

For question 10, you can take one-hundred percent confidence/certainty, i.e., 1, and subtract the significance value (of any variable, but in this instance, you are asked to think about "experience") and it will give you the confidence interval, which can be interpreted as the largest level of confidence you can have around the slope estimate for the "experience" coefficient before it crosses zero.