BADM /
211 Test 2 Questions With Correct Answers
/ // // // // // //
In //
a/
/dataset, /
/rows /
/and /
/columns /
/correspond /
/to /
/________ //and //_________ //respectively. //- //CORRECT //ANSWERS(S)✔✔rows //= //records //(y //axis
//of //data //points/observations)
columns //= //variables //(x //axis //of //variables/categories)
A/
/numerical /
/variable /
/can /
/be /
/defined /
/as /
/___________. //- /
/CORRECT //ANSWERS(S)✔✔where //the //measurement //or //number //has //a //numerical //meaning
Two /
/types /
/of /
/categorical /
/variables /
/are //____________ //and //____________. //- //CORRECT //ANSWERS(S)✔✔nominal //(not //ordered)
,ordinal //(ordered/ranking)
We //need //to //dummy //code //_____________ //. //- //CORRECT //ANSWERS(S)✔✔nominal //data
Two /
/ways /
/of /
/rescaling /
/the /
/data /
/are /
/____________ //. //- /
/CORRECT /
/ANSWERS(S)✔✔standardizing /
/(subtract /
/mean /
/from //each //column //and //divide //by //standard //deviation) //and //normalizing //(rescale //to //0-1 //by
//subtracting //min //and //dividing //by //max-min)
The /
/main /
/reason /
/for /
/doing //data //partitioning //is //_____________ //. //- //CORRECT //ANSWERS(S)✔✔create //clusters
Scatter /
/plots /
/represent /
/___________ //. //- /
/CORRECT //ANSWERS(S)✔✔how //much //one //variable //is //affected //by //another //(correlation)
We /
/use /
,/_________ /
/to /
/visualize /
/the /
/entire //distribution //of //a //variable. //- //CORRECT //ANSWERS(S)✔✔boxplots //and //histograms
What /
/is /
/linear /
/regression? //- /
/CORRECT /
/ANSWERS(S)✔✔Linear /
/regression /
/is //
a/
/statistical /
/technique /
/where /
/the /
/score /
/of //
a/
/variable //
Y/
/is /
/predicted /
/from /
/the /
/score /
/of //
a/
/second /
/variable //X. //X //is //referred //to //as //the //predictor //variable //and //Y //as //the //criterion //variable.
What /
/is //predictive //modeling //and //explanatory //modeling? //What //are //the //differences? //- //CORRECT
, ANSWERS(S)✔✔Predictive /
//
/modeling: //data //mining //technique //used //to //predict //future //behavior //and //anticipate //change
Explanatory /
/modeling: /
/model //that //fits //well //with //existing //data, //on //which //it //was //trained. //Focus //on //coefficients
Explanatory //is //evaluating //how //well //the //predictive //model //explains //an //outcome
Beta /
/coefficients /
/represent /
/________________. //- /
/CORRECT //ANSWERS(S)✔✔the //degree //of //change //in //the //outcome //variable //for //every //1-
unit //of //change //in //the //predictor //variable.
The //higher //the //error, //the //____________ //model //- //CORRECT //ANSWERS(S)✔✔less //accurate
In /
/explanatory /
/modeling /
/goodness /
/of //fit //can //be //assessed //using //________. //- //CORRECT //ANSWERS(S)✔✔standard //error //(r^2)
Mean /
/error /
/gives /
/us /
/information /
/____________ //. //- /
/CORRECT //ANSWERS(S)✔✔on //indicating //forecast //bias //(over/underpredicting)
211 Test 2 Questions With Correct Answers
/ // // // // // //
In //
a/
/dataset, /
/rows /
/and /
/columns /
/correspond /
/to /
/________ //and //_________ //respectively. //- //CORRECT //ANSWERS(S)✔✔rows //= //records //(y //axis
//of //data //points/observations)
columns //= //variables //(x //axis //of //variables/categories)
A/
/numerical /
/variable /
/can /
/be /
/defined /
/as /
/___________. //- /
/CORRECT //ANSWERS(S)✔✔where //the //measurement //or //number //has //a //numerical //meaning
Two /
/types /
/of /
/categorical /
/variables /
/are //____________ //and //____________. //- //CORRECT //ANSWERS(S)✔✔nominal //(not //ordered)
,ordinal //(ordered/ranking)
We //need //to //dummy //code //_____________ //. //- //CORRECT //ANSWERS(S)✔✔nominal //data
Two /
/ways /
/of /
/rescaling /
/the /
/data /
/are /
/____________ //. //- /
/CORRECT /
/ANSWERS(S)✔✔standardizing /
/(subtract /
/mean /
/from //each //column //and //divide //by //standard //deviation) //and //normalizing //(rescale //to //0-1 //by
//subtracting //min //and //dividing //by //max-min)
The /
/main /
/reason /
/for /
/doing //data //partitioning //is //_____________ //. //- //CORRECT //ANSWERS(S)✔✔create //clusters
Scatter /
/plots /
/represent /
/___________ //. //- /
/CORRECT //ANSWERS(S)✔✔how //much //one //variable //is //affected //by //another //(correlation)
We /
/use /
,/_________ /
/to /
/visualize /
/the /
/entire //distribution //of //a //variable. //- //CORRECT //ANSWERS(S)✔✔boxplots //and //histograms
What /
/is /
/linear /
/regression? //- /
/CORRECT /
/ANSWERS(S)✔✔Linear /
/regression /
/is //
a/
/statistical /
/technique /
/where /
/the /
/score /
/of //
a/
/variable //
Y/
/is /
/predicted /
/from /
/the /
/score /
/of //
a/
/second /
/variable //X. //X //is //referred //to //as //the //predictor //variable //and //Y //as //the //criterion //variable.
What /
/is //predictive //modeling //and //explanatory //modeling? //What //are //the //differences? //- //CORRECT
, ANSWERS(S)✔✔Predictive /
//
/modeling: //data //mining //technique //used //to //predict //future //behavior //and //anticipate //change
Explanatory /
/modeling: /
/model //that //fits //well //with //existing //data, //on //which //it //was //trained. //Focus //on //coefficients
Explanatory //is //evaluating //how //well //the //predictive //model //explains //an //outcome
Beta /
/coefficients /
/represent /
/________________. //- /
/CORRECT //ANSWERS(S)✔✔the //degree //of //change //in //the //outcome //variable //for //every //1-
unit //of //change //in //the //predictor //variable.
The //higher //the //error, //the //____________ //model //- //CORRECT //ANSWERS(S)✔✔less //accurate
In /
/explanatory /
/modeling /
/goodness /
/of //fit //can //be //assessed //using //________. //- //CORRECT //ANSWERS(S)✔✔standard //error //(r^2)
Mean /
/error /
/gives /
/us /
/information /
/____________ //. //- /
/CORRECT //ANSWERS(S)✔✔on //indicating //forecast //bias //(over/underpredicting)
