# Quiz 4 - Name Date Quiz #4 MAT109 SUBMIT COMPLETED TESTS...

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Name Quiz #4 MAT109 Date SUBMIT COMPLETED TESTS VIA WEBCT EMAIL - NOT THE DISCUSSION ROOM. Please make sure your name is on the document you attach, and include your initials in the name of the document, e.g., Quiz 2PK.doc. Make sure to attach after you choose your document. Thank you. 1) Write the null and alternative hypotheses, and identify the type(s) of hypothesis test(s) that may be appropriate to test the hypothesis (given the conditions for using the test are satisfied). a)Are UW students younger, on average, than 25 years of age? Ho:μ = 25, H1: < 25 This is a left tailed test because we are trying to find out if the UW students are younger than 25 years old on average. b) Does the weight of chips in a “6.2 ounce” bag of a certain brand of chips differ, on average, from the claimed weight? Ho:μ = 6.2 ounces, H1: 25 This hypothesis deals with a population mean, if the mean weight of chips in a 6.2 ounce bag of certain chip is different from the claimed weight, the population mean is 6.2 ounces. This is a two tailed test. c)Does the percentage of contaminants in a certain breakfast cereal exceed the maximum allowable industry standard of 2%? (Hopefully, the standard is much lower than this.) Ho:μ = 2%, H1: > 2% Right tailed test because we are looking for contaminants that are in certain cereals more than 2%. d) Are a majority (>50%) of men bald? Ho: μ = 50%, H1: > 50% Right tailed test, because we are trying to find out I majority of men are bald 2) A one-sample z -test is conducted to see if the data provide sufficient evidence at the α =.05 level of significance to conclude that the mean weight of Seattle differs from 2.0 kilograms. A simple random sample of 25 Seattle rats is found to have a sample mean weight of 2.30 kilograms.

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## This note was uploaded on 11/21/2009 for the course MATH 109 taught by Professor Kurose during the Spring '09 term at Nashville State Community College.

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Quiz 4 - Name Date Quiz #4 MAT109 SUBMIT COMPLETED TESTS...

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