Posted by Meep on Wednesday, October 31, 2012 at 11:21am.
You can try a proportional one-sample z-test for this one since this problem is using proportions.
Using a formula for a proportional one-sample z-test with your data included, we have:
z = .16 - .10 -->test value (13/81 is .16) minus population value (.10) divided by
√[(.10)(.90)/81] --> .90 represents 1-.10 and 81 is sample size.
Finish the calculation. Use a z-table to determine the p-value for the z-test statistic.
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