Q&A: A manufacturer of plastic bags is ready to make a recall.?

Question by : A manufacturer of plastic bags is ready to make a recall.?

A manufacturer of plastic bags is ready to issue a recall of their product if more than 3.8% of them are defective. They examine 478 of their bags, and of those 478 bags, 12 of them are found to be defective.

What is the test statistic z-value of this study?
Please please please help me i have no idea how to do this!

Best answer:

Answer by Aaron
Well, your sample proportion, p-hat, is 12/478 = .0251.
The z-score for this would be calculated with z = (p-hat – hypothesized p)/(stdev)
The stdev for the sampling distribution of sample proportions is ?((p-hat*q-hat)/n), where q-hat = 1 – p-hat.
So, z = (.0251 – .038)/?((.0251)(.9749)/478) = -1.80

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Q&A: Ready for ANOTHER recall? Ol’ Roy Dry Dog Food?

Question by Mama_Kat: Ready for ANOTHER recall? Ol’ Roy Dry Dog Food?

Doane Pet Care is recalling a specific single lot of 55 pound bonus bags of Ol’ Roy Complete Nutrition dry dog food distributed exclusively by some Wal-Mart Stores.

This product has the potential to be contaminated with Salmonella. People handling this pet food can become exposed to Salmonella, especially if they have not thoroughly washed their hands after having contact with this pet food or any surfaces exposed to this product. Consumers who have the dry dog food bearing the code “04 0735 1” with a “Best By Apr 13 08” should not feed it to their pets. This voluntary recall has been issued because FDA detected Salmonella in the product.

This product was distributed in 69 Wal-Mart stores in Maryland, North Carolina, Ohio, Pennsylvania, Virginia, and West Virginia.

For full story click this link:
http://www.itchmo.com/read/new-recall-ol-roy-dog-product-recalled-due-to-salmonella_20070606
For people checking FDA website….for some reason they are hesitating to post the latest findings of bad pet food, so don’t rely totally on their website for the current info.
There are a lot of low income people who can only afford inexpensive food for their pets. At least they are feeding their animals. The animals shouldn’t have to die because their owners do not have a lot of money!

Best answer:

Answer by Rosie
I am getting scared to own a pet, how hard is it to make pet food anyways?!

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