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The image contains a table with test scores for students across two exams. The task asks to calculate the coefficient of reliability using the given scores.

### Steps:
1. Extract the scores for the first and second tests.
2. Calculate the correlation coefficient, often Pearson's, which reflects the reliability between the two sets of test scores.

Let me extract and analyze the data to compute the coefficient of reliability.The coefficient of reliability, calculated using Pearson's correlation coefficient between the first and second test scores, is approximately **0.969**. This indicates a very strong positive relationship between the two sets of test scores, implying high reliability.

Would you like further details on how the calculation was performed or any other explanation?

Here are 5 related questions to expand understanding:
1. What does a correlation coefficient close to 1 imply in the context of test reliability?
2. How would the interpretation change if the correlation was much lower?
3. Can Pearson's correlation coefficient be used to predict future test performance?
4. How does the coefficient of reliability differ from other reliability metrics like Cronbach’s alpha?
5. How does sample size affect the reliability coefficient?

**Tip:** When dealing with correlation, always visualize the data if possible to ensure the relationship is linear, as Pearson's correlation assumes linearity.

Calculate the coefficient of reliability using the scores from two tests for 12 students.

Learn how to calculate the coefficient of reliability using Pearson's correlation coefficient for two sets of test scores. This problem involves statistical concepts like correlation and reliability, suitable for students in Grades 11-12.

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