急問when do we use one or two tailed test in Hypothesis Test?
我想知one or two tailed test 幾時用??
- 1 十年前最愛解答
1-tail /2-tail is related to Ha.
Ho usually is " = "
When Ha is " not = " , we use 2-tail.
When Ha is " >" we use 1-tail.
Whaen Ha is " < ", we also use 1-tail.資料來源： my tutor taught this.
It relates to the setting of Ha.
If Ha <> (NOT EQIUAL) 50 (say), then it is two tailed test.
If Ha > / < 50 (say), then it is one tailed test.
You may ask when do we set the above hypothesis, then you should refer to the question.資料來源： me