AQA Statistics 1 6.03 Given a large Sample, find a 99% Confidence Interval

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I can't find the inverse using my calculator, I'm using the fx-991MS
Please help!!

ashangel
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For the confidence interval values, does it matter which way round they go?

mrtneditz
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how did you found the inverse using the calculator?

daniamurdock
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if it was less than 30 what do you use then?

reecemellor