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If we test H0: u=40 vs Ha: u < 40, this test it A. One sided...

If we test H0: u=40 vs Ha: u < 40, this test it

A. One sided (left tail)
B. One sided (right tail)
C. Two sided
D. Robust

Math   Statistics-And-Probability   
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Answer #1

In the above question

We have to test Ho: u=40 vs Ha:u < 40 this test is One sided (left tail).

Because the test is two sided or one sided is decide from the type alternative hypothesis.

There are 3 types of alternative hypothesis as One sided (left tail), One sided (right tail) and Two sided.

1) If Ha:u < 40, then the test is One sided (left tail)

2) If Ha:u > 40, then the test is One sided (right tail)

3) If Ha:u 40, then the test is One sided

Summary : -If we test H0: u=40 vs Ha: u < 40, this test is One sided (left tail)

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