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Sample T-Test Report

Decent Essays

Reflection 29: Testing for Significant Difference Between Principal Preparation Programs Methods A t-test is used to evaluate statistically significant differences between two samples (Creighton, 2007). For this assignment, I tested the null hypothesis stating there is no significant difference between Principal Corps (PC) School Leaders Licensure Assessment (SLLA) scores and the SLLA scores of those enrolled in the Educational Leadership Principal Cohort program. To conduct my t-tests, I first downloaded the SLLA data for PC and Cohort participants from Blackboard and transferred it to a Google Sheet. I then used the XLMiner Analysis ToolPak to run two separate two-sample t-tests assuming unequal variances. The first test examined significant …show more content…

The two-tail significance value was p = 0.02. The mean PC SLLA score was 178.4, and the mean Cohort SLLA score was 174.37. The summary report for the CKS standard of the SLLA exam showed a t-Stat value of 1.59 and a two-tail t-critical value of 2.01 . The two-tail significance value was p = 0.12. The mean PC percentage was 82%, and the mean Cohort percentage was 77.9%. The results provide conflicting information in regards to the differences between the two principal preparation programs. The SLLA Total Score t-Stat value (2.49) exceeded the t-critical value (2.02), suggesting the null hypothesis should be rejected; nevertheless, the data from the CKS standard suggests just the opposite. In this case, the t-Stat value (1.59) failed to exceed the t-critical value (2.01), meaning the null hypothesis should be accepted. These discrepancies in the data, however, do not indicate a failed test, but rather demonstrate the extent of the differences between the program. While we can conclude PC participants score significantly higher than Cohort participants on the SLLA, we cannot conclude this trend is overwhelming or permanent, as it does not apply to certain sub-sections of the

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