Reference no: EM133295228

Question 1. A leaf in a decision tree that shows more than one split (think the Titanic example where a leaf resolves to 10 survived, 5 died) is referred to as what kind of leaf?

a) Alternate leaf

b) Multiple leaf

c) Impure leaf

d) Compound leaf

Question 2. What is a confusion matrix?

a) a confusion matrix is a table that summarizes a classification (like the employee turnover or Titanic model) by showing the number of correct and incorrect predictions.

b) a confusion matrix is a table that shows the optimization choices in order to achieve better model performance (like the employee turnover or Titanic model).

Question 3. Select all options that describe why a company would be interested in developing an employee turnover model.

a) To identify employees thinking of leaving

b) To be proactive and try to redirect employee's exhibiting turnover patterns.

c) Identify employee churn costs by seeing the frequency and patterns where employee turnover first occurs.

Question 4. A data model that has a predictive accuracy of 50% would be considered.

a) Too random to base decisions on

b) Still an acceptable risk

c) Acceptable, but with an asterisk

Question 5. Attrition occurs when leaving employees in a company are not replaced but churn refers to employee turnover, both voluntary and involuntary.

a) True

b) False

Question 6. What can word frequencies in Voyant Tools tell us about, for example, employee comments? Select all the answers that apply.

a) Word frequencies can help us to understand the repetition of words across all the submitted comments.

b) Word frequencies help us understand the vocabulary density across all comments.

c) Word frequencies help us understand the sentiment of what is expressed in the comments.