Part D

Problem 2 (0.5 x 6 = 3 point) Subjects Download the "Teaching Assistant Evaluation Data Set" data: ing Repository. The link is archive.ics.uci.edu/ml/datasets/Tc Graphing Read the data in its original format (.data) by using the functi in an appropriate way and rename each variable according to In this dataset, each of the 151 observation corresponds to a unique teaching assistant (TA), so create a variable of TA identification (ID) number and assign an ID number from 1 to 151 to all TAs sequentially. In addition, for simplicity (although it may not be true in this case), assume each class can only have one TA at a time. Therefore, each of the 151 observation corresponds to a unique course at a time. If you see multiple observations share the same instructor ID and course ID, that probably means that the courses occurred in different year or semester. (a) Turn the first variable (whether of not the TA is a native English speaker) into a logical variable, where TRUE corresponds to a native English speaker, and FALSE otherwise (b) Turn the fourth variable (summer or regular semester) into a logical variable, where TRUE corresponds to regular, and FALSE corresponds to summer (C) Turn the last variable (class attribute or evaluation score) into an ordered factor vari- able with levels labeled as 'low', 'medium' and 'high' Hint: You should get the following response (other than variable names) after apply- ing the str() function on the cleaned dataset data. frame': 151 obs. of 6 variables: $ eng-speaker : logi TRUE FALSE TRUE TRUE FALSE FALSE $ instructor_id: int 23 15 23 5 7 23 9 10 22 15 ... $ course_id 3 3 3 2 11 3 5 3 3 3 $ regular : logi FALSE FALSE TRUE TRUE TRUE FALSE $ size 19 17 49 33 55 20 19 27 58 20... Factor w/ 3 levels "low","medium",..: 33 3 3 3 3 3 3 3 3 ... $ taid 1 2 3 4 5 6 7 8 9 10 : int : int $ score : : int (d) What is the average and median class size in regular semester? What are those two numbers in summer semester? Round your numeric answer to 2 decimal places. (e) How many native English speaker Tas are there in regular and summer semester, respectively? What are those two numbers for non native English speaker TAS? Problem 2 (0.5 x 6 = 3 point) Subjects Download the "Teaching Assistant Evaluation Data Set" data: ing Repository. The link is archive.ics.uci.edu/ml/datasets/Tc Graphing Read the data in its original format (.data) by using the functi in an appropriate way and rename each variable according to In this dataset, each of the 151 observation corresponds to a unique teaching assistant (TA), so create a variable of TA identification (ID) number and assign an ID number from 1 to 151 to all TAs sequentially. In addition, for simplicity (although it may not be true in this case), assume each class can only have one TA at a time. Therefore, each of the 151 observation corresponds to a unique course at a time. If you see multiple observations share the same instructor ID and course ID, that probably means that the courses occurred in different year or semester. (a) Turn the first variable (whether of not the TA is a native English speaker) into a logical variable, where TRUE corresponds to a native English speaker, and FALSE otherwise (b) Turn the fourth variable (summer or regular semester) into a logical variable, where TRUE corresponds to regular, and FALSE corresponds to summer (C) Turn the last variable (class attribute or evaluation score) into an ordered factor vari- able with levels labeled as 'low', 'medium' and 'high' Hint: You should get the following response (other than variable names) after apply- ing the str() function on the cleaned dataset data. frame': 151 obs. of 6 variables: $ eng-speaker : logi TRUE FALSE TRUE TRUE FALSE FALSE $ instructor_id: int 23 15 23 5 7 23 9 10 22 15 ... $ course_id 3 3 3 2 11 3 5 3 3 3 $ regular : logi FALSE FALSE TRUE TRUE TRUE FALSE $ size 19 17 49 33 55 20 19 27 58 20... Factor w/ 3 levels "low","medium",..: 33 3 3 3 3 3 3 3 3 ... $ taid 1 2 3 4 5 6 7 8 9 10 : int : int $ score : : int (d) What is the average and median class size in regular semester? What are those two numbers in summer semester? Round your numeric answer to 2 decimal places. (e) How many native English speaker Tas are there in regular and summer semester, respectively? What are those two numbers for non native English speaker TAS