When performing a study what is a type 1 error?
A Type I error is committed whenever a true null hypothesis is
rejected. A Type II error is committed whenever a false null
hypothesis is accepted. The best way to explain this is by an
example. Suppose a company develops a new drug. The FDA has to
decide whether or not the new drug is safe. The null hypothesis
here is that the new drug is not safe. A Type I error is committed
when a true null hypothesis is rejected, e.g. the FDA concludes
that the new drug is safe when it is not. A Type II error occurs
whenever a false null hypothesis is accepted, e.g. the drug is
declared unsafe, when in fact it is safe. Hope this helps.