Math Problem Statement

Researchers asked a random sample of students at a local college if they ever use dating apps. They found that 53.2% of the sample have a margin of error of ±7%. Interpret the 95% confidence interval.

Solution

The problem asks you to interpret the 95% confidence interval for the sample proportion. Here's the step-by-step breakdown of how to interpret it:

Given:

  • Sample proportion = 53.2%
  • Margin of error = ±7%

The confidence interval can be found by adding and subtracting the margin of error from the sample proportion.

To find the 95% confidence interval:

  • Lower bound = 53.2% - 7% = 46.2%
  • Upper bound = 53.2% + 7% = 60.2%

Conclusion:

The 95% confidence interval is between 46.2% and 60.2%.

This means the researchers estimate with 95% confidence that the true proportion of college students who use dating apps lies between 46.2% and 60.2%.

Would you like further details on this? Let me know if you have any questions.

Here are 5 related questions to deepen your understanding:

  1. What does a 95% confidence level mean in this context?
  2. How does increasing the sample size affect the margin of error in a confidence interval?
  3. If the confidence level were raised to 99%, how would the interval change?
  4. What assumptions must be true for this confidence interval to be valid?
  5. How is the margin of error calculated in such a scenario?

Tip: The confidence interval gives a range where the true population proportion likely lies, but increasing confidence (e.g., to 99%) usually increases the width of the interval.

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Math Problem Analysis

Mathematical Concepts

Statistics
Confidence Intervals
Margin of Error

Formulas

Confidence Interval: p ± Margin of Error

Theorems

Normal Distribution Approximation for Proportions

Suitable Grade Level

Grades 11-12