Applied Mathematics · Ch 7 — Inferential Statistics
t-Test (a Test of Difference for Parametric Data)
7.3
t-Test (a Test of Difference for Parametric Data)
Sometimes a decision requires more than describing a sample — it requires deciding whether an observed difference is real or just noise. This section introduces hypothesis testing, the formal framework for making that call, and then applies it through the t-test, a technique for checking whether a sample mean genuinely differs from a known value, or whether two independent samp …
Figure 5.2The t-distribution compared with the standard normal curve: the t-distribution is bell-shaped but has heavier tails, used for small samples
Drawn by us to help you understand the concept clearly, and verified to make sure it's accurate. For exams, practice from your NCERT textbook's own diagram.
The t-distribution is bell-shaped like the standard normal but has heavier tails, which matters …