Data Analysis Fundamentals Flashcards
7 cards from real DAC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Data Analysis Fundamentals flashcards as text
A KPI dashboard should primarily focus on what?
Answer: A small set of metrics tied to business goals
Effective dashboards highlight a focused set of key performance indicators aligned to objectives.
Which type of analysis answers the question 'What happened?'
Answer: Descriptive analysis
Descriptive analysis summarizes past data to explain what has already occurred.
What is the median of the values 3, 7, 8, 12, 100?
Answer: 8
With five sorted values, the middle one is 8.
Which type of analysis uses historical data to forecast future outcomes?
Answer: Predictive
Predictive analysis applies models to historical data to estimate future results.
Converting a categorical variable into 0/1 columns for modeling is called what?
Answer: One-hot encoding
One-hot encoding creates a binary indicator column for each category.
A p-value below 0.05 in a hypothesis test generally suggests what?
Answer: The result is statistically significant
A p-value under the 0.05 threshold typically indicates statistically significant evidence against the null hypothesis.
Grouping continuous ages into ranges like 0-18, 19-35, 36-60 is an example of what?
Answer: Binning
Binning buckets continuous values into discrete interval categories.