Virtual Job Tryout Data Analysis and Interpretation 3 — Questions and Answers
Question 1: A scatterplot shows a strong negative correlation between employee commute time and job satisfaction. What does this mean?
- Longer commutes tend to coincide with lower satisfaction (Correct answer)
- Shorter commutes cause higher satisfaction
- There is no relationship between the variables
- Satisfaction is the cause of commute time
Correct answer: Longer commutes tend to coincide with lower satisfaction
A negative correlation means as one variable increases, the other tends to decrease, but correlation does not imply causation.
Question 2: Data shows 60 defective units out of 1,500 produced. What is the defect rate?
- 4% (Correct answer)
- 3%
- 5%
- 6%
Correct answer: 4%
60 / 1,500 × 100 = 4% defect rate.
Question 3: A line graph shows revenue declining steadily for 6 months. A manager claims this month's slight uptick means the trend has reversed. This reasoning is an example of:
- Overgeneralizing from a single data point (Correct answer)
- Correct trend analysis
- Confirmation bias
- Regression to the mean
Correct answer: Overgeneralizing from a single data point
One data point is insufficient to declare a trend reversal in a 6-month declining pattern.
Question 4: A pivot table shows total sales by region. The West region shows $340K out of $1.2M total. What percentage does the West represent?
- 28.3% (Correct answer)
- 25.0%
- 30.1%
- 22.7%
Correct answer: 28.3%
$340K / $1,200K × 100 ≈ 28.3%.
Question 5: You review data showing average call handle time increased from 4.2 to 5.1 minutes. By how many seconds did it increase?
- 54 seconds (Correct answer)
- 48 seconds
- 60 seconds
- 42 seconds
Correct answer: 54 seconds
0.9 minutes × 60 seconds/minute = 54 seconds.
Question 6: A histogram is skewed to the right. Which statement is most likely true about this dataset?
- The mean is greater than the median (Correct answer)
- The median is greater than the mean
- Mean and median are equal
- The data has no outliers
Correct answer: The mean is greater than the median
In a right-skewed distribution, high-value outliers pull the mean above the median.
Question 7: A report shows 3 out of every 8 customers who visit a webpage make a purchase. If 2,400 customers visit, how many purchases are expected?
- 900 (Correct answer)
- 800
- 1,000
- 750
Correct answer: 900
2,400 × (3/8) = 900 expected purchases.
Virtual Job Tryout Data Analysis and Interpretation 3
A scatterplot shows a strong negative correlation between employee commute time and job satisfaction.
What does this mean?