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The population size is 55, whereas the sample size is 48. The same sample is measured twice to determine pre and post scores. Initial plans

The population size is 55, whereas the sample size is 48. The same sample is measured twice to determine pre and post scores. Initial plans called for a paired t-test. But we have 25 survey questions utilizing a 6-point likert scale. Another teacher told me I cant perform getting the mean on likert scales. How can I perform a t-test calculation? What are the values it requires? Please show me a solution with the same conditions as mine thanks!

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