Percentage Error Mean

StatsSeeker

New member
Joined
Jan 8, 2019
Messages
1
Hi there,

I wanted to check I haven’t made a mistake with something:
I have a range of percentage errors and i need to test that the percentage error rate is >20%, Then I need to find the confidence error level (95%) for the population mean.


I basically took the mean of the figures below and it = 26 and then used this mean to calculate the confidence internal (using the standard deviation, which was 3.31)


I got 24.9-27.2

Can some please advise if I have done something wrong.

Thank you and much appreciated.




Here are the numbers


31.721.720.721.729.725.724.727.728.7
25.728.727.723.721.731.727.727.725.7
19.725.727.723.724.730.726.722.728.7
 
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