Listed below are recorded speeds (in miles/hour: mph) of randomly selected cars traveling on a section of Highwa 405 in Los Angeles (based upon data from Sigalert). That section has a posted speed limit of 65mph. Traffic engineers often establish speed limits by using the "85th percentile rule," whereby the speed limit is set so that 85% of drivers are at or below the speed limit. • Frequency Table: class width 3; midpoint of first class 56 68 68 72 73 65 75 73 72 68 65 65 73 66 71 68 74 66 71 65 73 59 75 72 66 58 70 56 75 68 75 62 60 73 61 75 74 60 73 58 75

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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The text provides data and analysis parameters related to the speeds of randomly selected cars on a section of Highway 405 in Los Angeles, with a posted speed limit of 65 mph. Traffic engineers often use the "85th percentile rule" to set speed limits.

### Data:

- **Speeds (in mph):**
  - Row 1: 66, 68, 72, 73, 65, 75, 73, 72, 68, 65
  - Row 2: 58, 66, 70, 71, 66, 74, 60, 71, 63, 72
  - Row 3: 59, 75, 70, 56, 66, 75, 68, 75, 62, 72
  - Row 4: 60, 73, 61, 75, 58, 74, 60

### Frequency Analysis:

- **Frequency Table:**
  - Class width: 3
  - Midpoint of first class: 56

### Statistical Analysis:

- **Statistics:**
  - Mean
  - Standard Deviation (Std. Dev.)
  - Skewness (Skew)
  - Z-score

- **5-number Summary:**
  - Minimum (MIN)
  - First Quartile (Q₁)
  - Median (Q₂)
  - Third Quartile (Q₃)
  - Maximum (MAX)

### Visual Analysis:

- **Ogive:**
  - Used for displaying cumulative frequencies graphically.
  
- **Modified Box Plot:**
  - Useful for visualizing the spread of the speed data and identifying outliers.

No specific labels, statistics, or data entries for the statistical analysis are provided in the text.
Transcribed Image Text:The text provides data and analysis parameters related to the speeds of randomly selected cars on a section of Highway 405 in Los Angeles, with a posted speed limit of 65 mph. Traffic engineers often use the "85th percentile rule" to set speed limits. ### Data: - **Speeds (in mph):** - Row 1: 66, 68, 72, 73, 65, 75, 73, 72, 68, 65 - Row 2: 58, 66, 70, 71, 66, 74, 60, 71, 63, 72 - Row 3: 59, 75, 70, 56, 66, 75, 68, 75, 62, 72 - Row 4: 60, 73, 61, 75, 58, 74, 60 ### Frequency Analysis: - **Frequency Table:** - Class width: 3 - Midpoint of first class: 56 ### Statistical Analysis: - **Statistics:** - Mean - Standard Deviation (Std. Dev.) - Skewness (Skew) - Z-score - **5-number Summary:** - Minimum (MIN) - First Quartile (Q₁) - Median (Q₂) - Third Quartile (Q₃) - Maximum (MAX) ### Visual Analysis: - **Ogive:** - Used for displaying cumulative frequencies graphically. - **Modified Box Plot:** - Useful for visualizing the spread of the speed data and identifying outliers. No specific labels, statistics, or data entries for the statistical analysis are provided in the text.
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