D204 WGU:DATA ANALYTICS

D204 The Data Analytics Journey questions and answers

Which of these is NOT a topic of interest for Discovery/Planning/Business Understanding? A. Project Scope B. Identify stakeholders and research questions/KPIs C. Build a data pipeline (ETL) D. Identify timeline, budget, and participants C What is a potential problem to consider in the planning phase? A. Lack of clear focus on stakeholders, timeline, limitations, and budget B. Quality and type of data may make access more difficult C. Some cleaning techniques could dramatically cha...

Data scientists are able to find ______, _________, and _____ in unstructured data. order, meaning, and value What is involved in the planning phase? 1. Defining goals 2. Organizing resources 3. Coordinate people 4. Schedule project What is involved in the wrangling phase? 5. Get data 6. Clean data 7. Explore data 8. Refine data What is involved in the Modeling phase? 9. Create model 10. Validate model 11. Evaluate model 12. Refine model What is involved ...

Tautology Compound proposition that is always true regardless of the truth value of individual propositions (Always ends up true) Contradiction Compound proposition that is always false regardless of the truth value of individual propositions (Always ends up false) Logical Equivalence When two different compound propositions have the same results for inputs Idempotent Propositional Law: PvP = P, P^P = P ('^' represents And) Associative Propositional Law: (PvQ)v...

Exclusive or. ⊕ One or the other, but not both. We can go to the park or the movies. inclusive or is a: disjunction Order of operations in absence of parentheses. 1. ¬ (not) 2. ∧ (and) 3. ∨ (or) the rule is that negation is applied first, then conjunction, then disjunction: truth table with three variables see pic 2^3 rows proposition p → q Ex: If it is raining today, the game will be cancelled. Converse: q → p If the game is cancelled...

Proof by Exhaustion Prove the statement by checking each element individually. Unlike proof by cases, exhaustive proof looks at every case in a way that is not general. Proof by Counterexample Used to disprove a universal statement. For example, to disprove the statement, "All prime numbers are odd" find one example where this statement is false—the number 2—which is both even and prime. Direct Proof In the direct proof, we assume the hypothesis p is true and we try to pro...