Math Problem Statement
Each year, tornadoes that touch down are recorded. The following table gives the number of tornadoes that touched down during each month of one year. Determine the range and sample standard deviation. 4 2 52 114 198 95 66 86 72 60 103 92
Solution
To solve for the range and sample standard deviation, we will follow these steps:
Step 1: Calculate the Range
The range is the difference between the maximum and minimum values in the dataset.
- Minimum value:
- Maximum value:
Step 2: Calculate the Sample Standard Deviation
The formula for sample standard deviation () is:
Where:
- represents each data point,
- is the sample mean,
- is the sample size.
Step 2.1: Find the Mean
First, we calculate the mean () of the dataTo solve for the range and sample standard deviation, we will follow these steps:
Step 1: Calculate the Range
The range is the difference between the maximum and minimum values in the dataset.
- Minimum value:
- Maximum value:
Step 2: Calculate the Sample Standard Deviation
The formula for sample standard deviation () is:
Where:
- represents each data point,
- is the sample mean,
- is the sample size.
Step 2.1: Find the Mean
First, we calculate the mean () of the
Let's compute the mean:
Step 2.2: Find the Squared Differences
Now, we calculate the squared differences between each data point and the mean:
Step 2.3: Compute the Sum of Squared Differences
Next, we sum these squared differences:
Step 2.4: Divide by
Since this is a sample, we divide by :
Step 2.5: Take the Square Root
Finally, we take the square root to find the sample standard deviation:
Final Answers:
- Range: 196
- Sample Standard Deviation: 51.39
Would you like more details or have any questions about these calculations?
Here are 5 relative questions that expand this information:
- How does the range affect the spread of the data?
- What is the difference between sample standard deviation and population standard deviation?
- How would the standard deviation change if the maximum value increased?
- Can you interpret what a high standard deviation means in this context?
- How does the sample size influence the accuracy of the standard deviation?
Tip: Always verify whether you're calculating the sample or population standard deviation, as this changes the divisor in the formula.
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Math Problem Analysis
Mathematical Concepts
Statistics
Descriptive Statistics
Range
Sample Standard Deviation
Formulas
Range = max(x) - min(x)
Sample Standard Deviation: s = sqrt((1/(n-1)) * Σ(x_i - x̄)^2)
Theorems
-
Suitable Grade Level
Grades 10-12
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