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    Assumptions/Violations/Concerns for Basic T-Test for Difference between Means?

    Hello, I work for a college which is interested in exploring whether or not students in Fall 2019 had a better/worse GPA, on average, compared to students in Fall 2020, by course. Looking at, say, Psychology 101, is it valid for me to do a t-test comparing the mean GPA for Psychology 101 in...
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    Logistic Regression Forecasts are Over-estimated

    Hi all, I have been trying to develop a logistic regression model which predicts future enrollment in part 2 of a required program sequence, based on characteristics displayed in part 1 of the sequence. Some people have missing data points and so some observations are dropped when building the...