Table of contents
- 1. Intro to Stats and Collecting Data55m
- 2. Describing Data with Tables and Graphs1h 55m
- 3. Describing Data Numerically1h 45m
- 4. Probability2h 16m
- 5. Binomial Distribution & Discrete Random Variables2h 33m
- 6. Normal Distribution and Continuous Random Variables1h 38m
- 7. Sampling Distributions & Confidence Intervals: Mean1h 3m
- 8. Sampling Distributions & Confidence Intervals: Proportion1h 12m
- 9. Hypothesis Testing for One Sample1h 1m
- 10. Hypothesis Testing for Two Samples2h 8m
- 11. Correlation48m
- 12. Regression1h 4m
- 13. Chi-Square Tests & Goodness of Fit1h 20m
- 14. ANOVA1h 0m
2. Describing Data with Tables and Graphs
Histograms
Problem 2.1.20d
Textbook Question
Use the frequency histogram
describe any patterns with the data..


1
Step 1: Observe the histogram and identify the key components. The x-axis represents the height of roller coasters (in feet), divided into intervals, while the y-axis represents the frequency (number of roller coasters) within each height interval.
Step 2: Note the distribution of the data. The histogram shows that the majority of roller coasters fall within the height range of 125 to 178 feet, as this interval has the highest frequency (approximately 40).
Step 3: Identify any patterns or trends. The data appears to be skewed to the right, as the frequency decreases for higher height intervals (231-284 feet and beyond). This suggests that taller roller coasters are less common.
Step 4: Consider the spread of the data. The heights range from 72 feet to 337 feet, indicating a wide variety of roller coaster heights. However, most roller coasters are concentrated in the lower height intervals.
Step 5: Summarize the findings. The histogram indicates that roller coasters are most commonly built within the height range of 125 to 178 feet, with fewer roller coasters at extreme heights. This could reflect design or safety considerations in roller coaster construction.

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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Frequency Histogram
A frequency histogram is a graphical representation of data that shows the frequency of data points within specified ranges, or bins. Each bar's height indicates the number of observations that fall within that range, allowing for a visual interpretation of the distribution of the data. In this case, the histogram displays the heights of roller coasters, making it easy to identify which height ranges are most common.
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Central Tendency
Central tendency refers to the statistical measures that describe the center of a data set, commonly represented by the mean, median, and mode. In the context of the histogram, the mode is particularly relevant as it indicates the height range with the highest frequency, which is 125 feet in this case. Understanding central tendency helps in summarizing the data and identifying typical values.
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Data Distribution Patterns
Data distribution patterns refer to the way data points are spread across different values, which can reveal trends, clusters, or gaps in the data. Analyzing the histogram can help identify whether the data is normally distributed, skewed, or has outliers. In this histogram, the concentration of roller coasters around 125 feet suggests a common height preference, while the tapering off at higher heights indicates fewer roller coasters at those elevations.
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