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Random forest is an ensemble classifier that consists of many decision trees and outputs the class that is the mode of the class’s output by individual trees.

Please briefly describe the primary 4 steps of k means clustering algorithm. (Hint: first step is randomly choose K data points to be centroids.) 

What is the primary purpose of python code quoted below? ## param_grid = { ‘bootstrap’: [True],   ‘max_depth’: [40, 60, 80, 100], ‘max_features’: [1,2,3],  ‘min_samples_leaf’: [3, 4, 5],   ‘min_samples_split’: [8, 10, 12],   ‘n_estimators’: [100, 200, 300, 1000] } rfc = RandomForestClassifier() grid_search = GridSearchCV(estimator = rfc, param_grid = param_grid,                       cv = 3, n_jobs = -1, verbose = True)               ##

What are the two primary tasks for machine learning?

Please use the data below, calculate the gini indexes: Record Attribute: home type Attribute: salary class 1 31 3 1 2 30 1 0 3 6 2 0 4 15 4 1 5 10 4 0 please calculate:  gini index (hometype 15) = ?  Gini index (split) = ? Please show your calculation process to get full points. (Hint: gini index formula: Gini index =1-∑(Pj2 ), where j range from 1 to n. Pj is relative frequency of class j in T; n is number of classes; T is data size. Gini index (split) = (N1/N) * gini(T1)+(N2/N)*gini(T2). )

In k-means clustering, a distance function is used to locate clusters. What are the two primary characteristics of the centroids?

The 5 boroughs of New York City are Brooklyn, Queens, Staten Island, The Bronx and 

Your coconut curry chickpea meal costs $7 to make and your general manager has decided on a 35% food cost percentage. What is the selling  price of your coconut curry chickpea meal?

It is illegal to ask someone “How old are you?” during an interview.

In Herzberg’s two-factor theory, managers need to be mindful of the following 2 factors: