# Type I and Type II Errors and Controllable Factors

Define a type I error and explain why it occurs. Explain a factor that the researcher can control to change the type I error. Also, explain how type I errors can be avoided.

Define a type II error and explain why it occurs. How do sample size, selection of alpha level, and precision of measurement affect the type II error rate? Explain a factor that the researcher can control to change the type II error.

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#### Solution Preview

Define a type I error and explain why it occurs. Explain a factor that the researcher can control to change the type I error. Also, explain how type I errors can be avoided.

Answer: A type I error is the error of rejecting the null hypothesis when the null hypothesis is true. (By Wiki)

Sample size is a factor that the ...

#### Solution Summary

Type I and type II errors are defined. An explanation of why it occurs is given.