Posted by Josh on Thursday, July 19, 2012 at 10:57am.
A researcher claims that at least 10% of all football helmets have manufacturing flaws that could potentially cause injury to the wearer. A sample of 200 helmets revealed that 24 helmets contained such defects.
a. Does this finding support the researcherâ€™s claim? Used a fixedlevel test with α = 0.01
b. Find the Pvalue for this test.

Statistics  MathGuru, Thursday, July 19, 2012 at 11:47pm
You can use a onesample proportional ztest for your data. (Test sample proportion = 24/200 and sample size = 200) Convert all fractions to decimals. Find the critical value in the appropriate table at .01 level of significance for a twotailed test. Compare the test statistic you calculate to the critical value from the table. If the test statistic exceeds the critical value, reject the null. If the test statistic does not exceed the critical value, do not reject the null. You can draw your conclusions from there.
Note: The pvalue is the actual level of the test statistic you calculate. Find using the appropriate table.
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