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Data Analytics Flashcards

6 cards from real NTN practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A police department's crime mapping software shows that burglaries cluster in three hotspots. What analytical technique is being used?

    Answer: Spatial analysis

    Spatial analysis examines geographic patterns and relationships in data. Crime mapping that identifies hotspot clusters is a classic example of spatial analysis used in law enforcement.

  2. An emergency dispatch center processes calls with the following priority levels: Priority 1 (life-threatening) averages 2 minutes handling time, Priority 2 (urgent) averages 5 minutes, and Priority 3 (non-urgent) averages 8 minutes. If daily call volume is 40% Priority 1, 35% Priority 2, and 25% Priority 3, what is the weighted average handling time per call?

    Answer: 4.55 minutes

    Weighted average = (0.40 × 2) + (0.35 × 5) + (0.25 × 8) = 0.8 + 1.75 + 2.0 = 4.55 minutes.

  3. Which of the following best describes a Type I error in the context of a public safety study?

    Answer: Concluding that a community policing program reduced crime when it actually had no effect

    A Type I error (false positive) occurs when the null hypothesis is incorrectly rejected — concluding there is an effect when none exists, such as claiming a program reduced crime when it did not.

  4. A 911 center tracked call volumes over 24 hours and found the data follows a normal distribution with a mean of 45 calls per hour and a standard deviation of 8. Approximately what percentage of hours will have between 37 and 53 calls?

    Answer: 68%

    In a normal distribution, approximately 68% of data falls within one standard deviation of the mean. 45 - 8 = 37 and 45 + 8 = 53, which represents ±1 standard deviation.

  5. A department collected response time data for 200 incidents. The five-number summary is: minimum 3.1 min, Q1 5.2 min, median 6.8 min, Q3 9.4 min, maximum 22.5 min. Which value is most likely an outlier?

    Answer: 22.5 minutes

    Using the IQR method: IQR = Q3 - Q1 = 9.4 - 5.2 = 4.2. The upper fence is Q3 + 1.5 × IQR = 9.4 + 6.3 = 15.7. Since 22.5 exceeds 15.7, it is an outlier.

  6. A fire department wants to predict future call volumes based on population growth, average temperature, and day of the week. Which analytical method is most appropriate?

    Answer: Multiple regression analysis

    Multiple regression analysis is used when predicting an outcome variable from two or more predictor variables. Since there are three predictors (population, temperature, day), multiple regression is the correct choice.