basically a question says
a sample of 36 parachutes were tested for quality control purpose and their opening altitude is recorded. a statician analysing the data wishes to test the null hypothesis against . He dicides on the following criteria:
Accept if the sample mean is less than or equal to 210m
Reject if the sample mean is more that 210m
(i) find the probability of making a type I error
can some one help me out please? i thought the prob of type I error was = significance level, but that doesn't seem to be given.
oh yh, mean is 200 and standard deviation is 30