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The Food and Drug Administration FDA is a U S government agency that regulates food and Brugs for consumer safety One thing the FDA regulates is the allowable insect parts in arious foods When wheat is ground into flour insects that were in the wheat are ground up as well The mean number of insect parts allowed in 100 grams about 3 ounces of wheat flour is 75 If the FDA finds more than this number they conduct further tests to determine if the flour is too contaminated by insect parts to be fit for human consumption The FDA takes a random sample of 35 bags of flour for evaluation and finds that they contain an average of 80 insect parts per 100 grams with a standard deviation of 6 3 Which hypothesis test should be used to determine whether the sample contains more than the allowed 75 insect parts per 100 grams Oz test for the population mean O t test for the population mean Oz test for the population proportion Ot test for the population proportion Note First decide if it is a MEAN or a PROPORTION problem We do not use t tests on proportion problems If you decide MEANS remember the Z tests are ONLY USED if they give you a POPULATION STANDARD DEVIATION It may or may not also contain a sample standard deviation as well A If you decide MEANS remember the T Tests are ONLY USED if you ONLY have the SAMPLE STANDARD DEVIATION You will not have prior information deviation

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