The IGNOU MST 021 Classical and Bayesian Inference study guide is meticulously crafted to cater to the needs of IGNOU students, providing a comprehensive exploration of both classical and Bayesian inference methods. Covering a wide range of topics including probability theory, hypothesis testing, estimation, and Bayesian analysis, the guide offers a detailed understanding of statistical inference principles and techniques. Through clear explanations, illustrative examples, and practical exercises, the material equips students with the knowledge and skills necessary to apply classical and Bayesian approaches to real-world problems effectively. Whether pursuing a career in academia, research, or industry, this guide serves as an invaluable resource, empowering IGNOU students to navigate the complexities of statistical inference with confidence and proficiency.