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# Problems in GARP's 2020 FRM material

#### David Harper CFA FRM

##### David Harper CFA FRM
Staff member
Subscriber
@MilaBank agree but tiny nit: should be "USD 100.4375 (= 100 + (0.5 × 0.875))" to reflect one-half the 0.875 coupon. Thank you!

#### MilaBank

##### New Member
@MilaBank agree but tiny nit: should be "USD 100.4375 (= 100 + (0.5 × 0.875))" to reflect one-half the 0.875 coupon. Thank you!
yes, sorry, my typo now

#### evolutionest

##### New Member
Hi! I have a concern about QA chapter 9 answer to the question 9.4, which says that the probability of including a single irrelevant regressor is 1 - alpha, where alpha is the test size. But shouldn't it actually be alpha? As I am understanding this is that including the irrelevant regressor is incorrectly rejecting the true 0-hypothesis, which is a Type 1 error and the probability of that is equal to the test size. Or am I missing something?

#### lucaslim

##### New Member
Chapter 11 page 141. is the calculation correct?

#### lushukai

##### Active Member
Subscriber
Hi @lucaslim ,

I did not see the exact page, but your question seems simple enough to say yes - the calculation is correct IF: