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Chapter 8: Reading Notes

by: Monique Vazquez-Davis

Chapter 8: Reading Notes TSOCWF 351 A

Monique Vazquez-Davis
University of Washington Tacoma
GPA 3.69
Applied Statistics
Janelle Eliasson Nannini

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About this Document

Chapter 8 notes, in-class notes, formulas, and steps.
Applied Statistics
Janelle Eliasson Nannini
Class Notes
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This 2 page Class Notes was uploaded by Monique Vazquez-Davis on Friday February 20, 2015. The Class Notes belongs to TSOCWF 351 A at University of Washington Tacoma taught by Janelle Eliasson Nannini in Fall. Since its upload, it has received 128 views. For similar materials see Applied Statistics in Social Work at University of Washington Tacoma.

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Date Created: 02/20/15
Chapter 8 Testing Hypotheses 0 Statistical Hypothesis Testing 0 A procedure that allowed us to evaluate hypotheses about population parameters based on sample statistics 0 Statistical Significance Test 5 Steps I Assumption I Hypotheses I Test Statistics I PValue I Conclusion I Assumption 0 Assume the sample was randomly selected 0 Assume the variable is measured at the intervalratio level 0 CAN NOT assume that the population is normally distributed 0 Hypotheses O Null Hypothesis I There is no statistical significant difference between the sample means of the two groups I Any observed difference is the result of sampling error 39 111le 0 Research Hypothesis Alternative Hypothesis I There is a statistical significant difference between the sample means of the two groups I A true population difference does exist 39 112 0 Test Tailed Test 0 TwoTailed I Null Hypothesis 39 H1H2 I Research Hypothesis H1 H2 O OneTailed I Null Hypothesis 39 12112 I Research Hypothesis 39 H1ltH2 O T Something proven Always True 0 t General truth Allows differences 0 P Value 0 The probability associated with the obtained z score 0 I Z 0 Alpha CC I The level of probability at which the null hypothesis is rejected I Customary to 05 01 or 001 0 Error with Hypothesis Testing I Type 1 0 The probability associated with rejecting a null hypothesis when it is true I Type 2 0 The probability associated with failing to reject a null hypothesis when it is false 0 P lt 05 rejects null hypothesis 0 P gt 05 retains null hypothesis 0 TTest 0 Test computed to test the null hypothesis about a population mean when the population standard deViation Sy is unknown and is estimated using sample standard deViation Sy u My T s 9N 0 Difference between two means Y 1 2 I TN1N22 S39Y1 2


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