question about error in hypothesis testing?
 

A container if filled with red and blue marbles. The true proportion of red marbles is 80%. You take a sample of 100 marbles. (You may use a significance level of 5%.)
(a) What is the probability of making a type I error?
(b) What is the probability of making a type II error?
(c) What is the power of the test?

:please: :please: :please: :please:

ลืมหมดแล้วครับ :blood:

(a) What is the probability of making a type I error?
Type I error = the probability of reject true null hypothesis = 5% (if significant level = 5%)
[regardless of how much the percentage of actual proportion of red marbles]

(b) What is the probability of making a type II error?
Type II error = the probability of failure to reject false null hypothesis = 1- power of the test >>> but I forgot what's the figure is ^_^

(c) What is the power of the test?
The probability of not making a type II error = (1-Type II error).

ขอเป็นภาษาไทยไม่ได้หรอครับ! :aah: :aah: :died: :died: :blood: :blood: ~ เห็นมีแต่ภาษาอังกฤษเกือบทุก หน้าเลยย:cry: :cry: :cry: นะครับ ^^ :please: :please: