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#1
I thought I understood this topic but I keep making errors with the signs I really dont know how it works

For this question I got part A correct but for part b I get x-16.12/1.60=0.5244
but the mark scheme says x-16.12/1.60=(-0.5244)

Likewise with this question aswell

I get 162-x/9=1.28 but the mark scheme says 162-x/9=(-1.28)
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6 years ago
#2
For the first question, I think you are right. You are trying to find the find the region which covers 0.7 from negative infinity to the answer to the question.
0
6 years ago
#3
(Original post by cera ess six)
I thought I understood this topic but I keep making errors with the signs I really dont know how it works

For this question I got part A correct but for part b I get x-16.12/1.60=0.5244
but the mark scheme says x-16.12/1.60=(-0.5244)

Likewise with this question aswell

I get 162-x/9=1.28 but the mark scheme says 162-x/9=(-1.28)
First question I think you're right.

Second question I think the mark scheme is right. Assuming 162 is mean for a female (?), apply the common sense test... if you solve for x in your equation, you get x = 162-(9*1.28)... does this seem reasonable? I don't think so. Remember that 90% of men are TALLER, so you're looking at lower tail probabilities.

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