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 fixed-level test with α = 0.01

b. Find the P-value for this test.

- Statistics -
**MathGuru**, Thursday, July 19, 2012 at 11:47pm
You can use a one-sample proportional z-test 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 two-tailed 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 p-value is the actual level of the test statistic you calculate. Find using the appropriate table.

## Answer This Question

## Related Questions

- Stat - The army reports that the distribution of head circumfererence among ...
- Economics - A factory producing motorcycle helmets employs six workers. At the ...
- statistics - Automobile racing, high-performance driving schools, and driver ...
- Statistics - A paper manufacturer claims that fewer than 1 in 100 of its reels (...
- math - irv has a bike store. he has 32 bikes and also some tricycles, tandem ...
- math - Bikes, Trikes and more At Brittany's Bike shop, she rents all kinds of ...
- math - Bikes, Trikes and more At Brittany's Bike shop, she rents all kinds of ...
- statistics - The number of defects in a random sample of 200 parts produced by a...
- Math- Algebra - Bikes, Trikes and more At Brittany's Bike shop, she rents all ...
- physics - Two 0.09 pith balls are suspended from the same point by threads 40 ...

More Related Questions