MINOR CLARIFICATION: The last few slides mistakenly have the Z-value at 1.98. It should be 1.96, to be completely precise (as was stated in a previous slide). But this shouldn't impact your calculation too much. For the test, you can simply use Z=2 for obtaining your 95% CI. That will give you sufficiently precise values.

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(Disclaimer: The medical information contained herein is intended for physician medical licensing exam review purposes only, and are not intended for diagnosis of any illness. If you think you may be suffering from any medical condition, you should consult your physician or seek immediate medical attention.)