what is the type of error for a non-normal distribution which statement best describes how a contaminated normal distribution affects type 1 and type 2 error rates? which type of error is higher when sigma is unknown and mu is a contaminated normal distribution. what is the actual type 1 error rate of sigma? what is the difference between sigma and nonnormal is type 1 error lower than nominal? when sigma is known is error what is the actual type 1 error in a non contaminated normal distribution what is the difference between normal and contaminated contaminated normal distribution what to expect how does sigma affect error what does sigma mean when sigma is unknown what is the type 1 error rate? what is type one error of contaminated normal distributions why is there an issue with type one error with sigma known what is a type one error rate what would type one error rate be when sigma is known? what is the actual type one error rate is a sigma distribution a contaminated normal distribution does sigma cause more CIs than nominal levels