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**CFA Practice Question**

Which of the following is (are) true?

II. Type II error occurs when we fail to reject the null when it is false

III. Type I error occurs if we fail to reject the alternative when it is false.

IV. Type II error is the event where we reject the alternative when it is true.

I. Type I error is the event in which we reject the null when it is false.

II. Type II error occurs when we fail to reject the null when it is false

III. Type I error occurs if we fail to reject the alternative when it is false.

IV. Type II error is the event where we reject the alternative when it is true.

A. II only

B. II, III & IV

C. I, II & IV

**Explanation:**Type I error is the event in which we reject the null when it is true. This is the same as failing to reject the alternative when it is false.

Type II error is the event in which we fail to reject the null when it is false. This is the same as rejecting the alternative when it is true.

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**User Contributed Comments**
7

User |
Comment |
---|---|

chenchow |
Good tricky question! |

jackwez |
definately one to slow down on... |

prigopou |
Note you cannot use accept to replace fail to reject. Accepting is not a condition in hypothesis testing.. you simply reject or fail to reject.. accepting implies that it is true. hypothesis testing isn't trying to prove something is true. |

andrewmorgan |
exactly, and you dont reject the alternative, you only reject or fail to reject the null! |

catsong |
Exactly! |

mary11 |
I even looked at my notes for this one and still got it wrong. |

kristen91 |
agree with prigopou, this is stat 101 stuff |