Hi, apreciate any help anyone can give. I'm currently teaching myself Alevel statistics from 'A Concise Course in ALevel Statistics' and I'm stuck on the below topic.
In the following example, I followed it through and understood how the process worked (or so I thought!)
I followed up to this point and then used the calculator rather than the Ztables as the syllabus has retired these and specifically advises students to use a calculator instead.
Using Normal CD mode, I input the following  Lower: 0.049, Upper: 1, SD: 0.0076, mean: 0.03.
I got the answer of 0.0064 which matches that given in the example. So far so good.
However, in practice, I struggled to apply this although I'm sure I'm following the same process and have been back over it quite a few times, so if anyone can help me out I'd be so grateful.
As you can see, my answer is 0.1446, but the answer the book gives is 0.0745, but I'm unclear where I've gone wrong along the way as I can't see that I've done anything differently than in the worked example.
Thanks in advance
In the following example, I followed it through and understood how the process worked (or so I thought!)
I followed up to this point and then used the calculator rather than the Ztables as the syllabus has retired these and specifically advises students to use a calculator instead.
Using Normal CD mode, I input the following  Lower: 0.049, Upper: 1, SD: 0.0076, mean: 0.03.
I got the answer of 0.0064 which matches that given in the example. So far so good.
However, in practice, I struggled to apply this although I'm sure I'm following the same process and have been back over it quite a few times, so if anyone can help me out I'd be so grateful.
As you can see, my answer is 0.1446, but the answer the book gives is 0.0745, but I'm unclear where I've gone wrong along the way as I can't see that I've done anything differently than in the worked example.
Thanks in advance
Attachments

17.3 KB Views: 1