BESC 3010 CH 3. QUESTIONS AND
ANSWERS | LATEST UPDATE |
2024/2025 | RATED A+
What role does a frequency polygon play in data visualization?
A frequency polygon is a graphical representation that connects the midpoints of each class
interval in a frequency distribution, helping to visualize t...
BESC 3010 CH 3. QUESTIONS AND
ANSWERS | LATEST UPDATE |
2024/2025 | RATED A+
What role does a frequency polygon play in data visualization?
✔✔A frequency polygon is a graphical representation that connects the midpoints of each class
interval in a frequency distribution, helping to visualize the shape and trends of the data
distribution.
How can you determine the mode when a dataset has multiple values with the same frequency?
✔✔In cases where multiple values share the highest frequency, the dataset is termed multimodal,
and all of these values can be considered modes.
What is the importance of using the interquartile range (IQR) when analyzing data?
✔✔The interquartile range (IQR) measures the spread of the middle 50% of the data, providing a
robust way to understand variability while minimizing the influence of outliers.
How does a z-score help in comparing different datasets?
✔✔A z-score standardizes data points by measuring their distance from the mean in terms of
standard deviations, allowing for comparisons across different datasets regardless of their scales.
1
, What does it mean if a dataset has a negative skew?
✔✔A negative skew indicates that the tail on the left side of the distribution is longer or fatter
than the right side, suggesting that most values are clustered on the higher end.
Explain how data can be visually summarized using a dot plot.
✔✔A dot plot summarizes data by placing a dot for each data point above a number line,
allowing for easy visualization of frequency and distribution.
What is the purpose of using a stem-and-leaf plot in statistics?
✔✔A stem-and-leaf plot displays quantitative data in a way that retains the original data while
providing a visual representation of its distribution, making it easier to identify patterns.
How can a contingency table aid in understanding relationships between categorical variables?
✔✔A contingency table organizes data into rows and columns based on two categorical
variables, allowing for analysis of the frequency and relationship between these variables.
What does it indicate if the standard deviation is small relative to the mean?
2
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