Applied Statistics and Probability for Engineers, Douglas C. Montgomery and George C. Runger, 2018 (John Wiley & Sons) - A standard textbook in applied statistics, offering explanations and examples of hypothesis testing, including the formulation of null and alternative hypotheses.
Introduction to Probability and Statistics (18.05), Jeremy Orloff, Jonathan Bloom, 2014 (MIT OpenCourseWare) - University-level course materials providing an introduction to probability and statistical inference, with sections dedicated to hypothesis testing.