Describe and Provide Examples of the Most Important Statistical Measures and Effective Visualizations of Data DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which chart type is best for showing the relationship between two continuous variables?

   • APie chart
   • BScatter plot
   • CBox plot
   • DHistogram
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   A histogram of a dataset shows a long tail extending to the right. How would you describe the shape of this distribution?

   • ALeptokurtic
   • BPositively skewed
   • CSymmetric
   • DNegatively skewed
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   What does kurtosis measure in a data distribution?

   • AThe symmetry of the distribution
   • BThe heaviness of the tails and peakedness of the distribution
   • CThe spread of the data around the mean
   • DThe central tendency of the data
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A researcher is studying the relationship between hours of study and exam scores for 100 students. The Pearson correlation coefficient is r = 0.70. Which of the following is the most accurate interpretation?

   • AStudying for more hours causes students to score 70% higher on exams.
   • B70% of the variation in exam scores is explained by hours of study.
   • CThere is a strong positive linear relationship; students who study more tend to score higher, but this does not prove that studying causes higher scores.
   • DThere is a weak positive relationship, and studying is not a good predictor of exam scores.
   Reveal Solution Discussion Select an answer first
6. 15application · easy

   A marketing team wants to compare the distribution of customer spending across three different customer segments (Gold, Silver, Bronze). They have spending data for thousands of customers in each segment. Which visualization would most effectively allow them to compare the median, spread, and presence of outliers across the three groups simultaneously?

   • AA single box plot for each segment placed side-by-side
   • BThree separate histograms on the same axis
   • CA stacked bar chart of average spending per segment
   • DA scatter plot of spending vs. segment number
   Reveal Solution Discussion Select an answer first