Describe a type I error and a type II error

 Describe a type I error and a type II error.What is the definition of incidence in epidemiology? Provide the formula for calculating incidence rate?What is the difference between prevalence measures and incidence measures?Assume a 2020 population of 451,000 people. 986 were infected with thenovel corona virus and 245 people died from the virus. What is the mortality rate and what is the case-fatality rate for the novel influenza virus? (Express your answer with a whole number e.g. 83 per 10,000 instead of 8.3 per 1,000; 38 per 100 instead of 37.8%) Why is it necessary to use standardized ratios in the measurement of morbidity and mortality instead of crude ratios?