Statistics for Data Science and Business Analysis - Test for the Mean; Independent Samples (Part 1)

The video tutorial covers hypothesis testing for independent samples with known variance. It begins with an example of comparing student grades from two departments, engineering and management, at a UK university. The tutorial explains how to set up hypotheses, calculate the test statistic using the Z score, and interpret the P value. It concludes with insights on understanding the test results and introduces the next topic on independent samples with unknown variances.

How is the test statistic calculated in this example?

What additional information can be inferred from the sign of the test statistic?