Data Project in R for data science, Slides of Database Programming

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UNCOVERING THE SECRET BEHIND

PROFESSOR MOODY’S GRADING

Analysis By: Tanvi Wagle

OVERVIEW:

A TA’S GENERAL

ADVICE

Your score is the

most important

factor in

determining your

grade

ALWAYS asking

questions lowers

your grade

FREQUENTLY go

on your

smartphone

Do not NEVER go

on your

smartphone

Do not ALWAYS

leave early

Coming late to

class does not

affect your grade

significantly.

RANGE OF SCORES FOR EACH GRADE R A N G E < - TA P P LY ( M O O DY 2 0 1 9 $ S C O R E , M O O DY 2 0 1 9 $ G R A D E , R A N G E ) Observations: Absolutes:

• (^) If you get a score > 89.67 you get an A
• (^) If you get a score between 72.93 to 89.67 you get an B
• (^) If you get a score between 44.76 to 72.93 you get an C
• (^) If you get a score < 20.22 you get an F Uncertainties: There is an OVERLAP in the ranges of the scores which means a person with a higher score can get a lower grade. For example: If a student gets between a 77.02 and 89. they can get either an A or a B. How is this possible? Professor Moody uses other information in addition to the score to determine the grade.

C AT E G O R I C A L D ATA C O M PA R I S O N F O R A -B RA N G E Asks Questions and On Smartphone are the categorical variables that have significant frequency differences between getting an A vs B.

• (^) Mosaic Plots help show the relationship between two categorical variables.
• (^) Between 77.02 and 89.67, the grade can be A or B.
• (^) I plotted the data for the uncertain range to see which variable had effects on which Predictions:^ grade was assigned. If you have a score between 77.02 and 89.67… If you are “sometimes” or ”never” asking questions you are more likely to get an A. If you are “frequently” on your smartphone you are more likely to get an A. If you are “never” on your smartphone you are more likely to get an B. You can repeat this process for the other uncertain grade ranges to determine whether

SEEING THOSE OBSERVATIONS ON ALL GRADES… A Score Greater than 77 and being Frequently on Smartphone has the largest effect on getting an A. On the other hand, Not Always Asking Questions and Not Always Leaving Early does not have that much effect on getting an A. Therefore, the right categorical variables are probably used to determine the grade when the score is in an uncertain range.

GUIDE TO GETTING AN A: ( I N O R D E R O F I M P O RTA N C E ) Do not always leave early Do not always ask questions Frequently go on your smartphone Get a Score Greater than 77 A l l < - m o o d y 2 0 1 9 [ m o o d y 2 0 1 9 $ a s k s _ q u e s t i o n s! = " a l w a y s " & m o o d y 2 0 1 9 $ o n _ s m a r t p h o n e = = " f r e q u e n t l y " & m o o d y 2 0 1 9 $ l e a v e s _ e a r l y = = " a l w a y s " & m o o d y 2 0 1 9 $ s c o r e > 7 7 , ]