What is Bayesian? Bayesian is a probability concept which interprets probability as a degree of belief. In A/B testing, bayesian probability offers an absolute level of a test result validity.
What is sample size? Sample size measures the number of individual samples measured or observations used in a survey or experiment. For example, if you test 100 tyres for wear and tear, your sample size is 100. If an online survey returned 93,000 completed questionnaires, your sample size is 93,000.