418-Z-test-ExtraPractice

418-Z-test-ExtraPractice - Z-test ( c h a p te r 7 ) Z-test...

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1 Z-test (chapter 7) Z-test practice: soap The manufacturer of soap claims that the average weight of soap per pack is 200 grams with a standard deviation of 5 grams. A retailer sampled 10 packs of this soap and got an average weight of 199.3 grams. • Is the mean of the sample less than the mean of the population? • Use = 0.05 and follow the steps in hypothesis testing. Z test practice: Soap Given: Population Mean Soap Weight = 200 Population SD = 5 Sample n = 10 Sample Mean Soap Weight = 199.3 State Hypotheses: H a : X sample < μ population H 0 : X sample μ population
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2 Individual Scores Comparing a Sample to the Population 200 199.3 5 Building a Sampling Distribution number of samples, n = 10 Sample Mean -2SD -1SD 200 +1SD +2SD Count/ Frequency 1 2 3 4 5 6 7 Population
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This note was uploaded on 09/15/2010 for the course PSY 418 taught by Professor Haley during the Spring '08 term at University of Texas at Austin.

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418-Z-test-ExtraPractice - Z-test ( c h a p te r 7 ) Z-test...

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