Ch 8 Sec 3

Ch 8 Sec 3 - Chapter8Section3 tTestforaMean Mr.KennethHorwitz 8.3tTestforaMean normallydistributed,isunknown X t= sn

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Chapter 8 Section 3 t  Test for a Mean Mr. Kenneth Horwitz
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8.3   t  Test for a Mean The  t   test is a statistical test for the mean of a population and is  used when the population is normally or approximately  normally distributed,  α  is unknown.      The formula for the  t test is The degrees of freedom are d.f. =  n  – 1. Note:  When the degrees of freedom are above 30, some  textbooks will tell you to use the nearest table value; however, in  this textbook, you should round down to the nearest table value.   This is a conservative approach. - = X t s n μ
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Table F Find the critical  t  value for  α  = 0.05 with d.f. = 16 for a right- tailed  t  test. Find the 0.05 column in the top row and 16 in the left-hand column. The critical  t  value  is +1.746.
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Find the critical  t  value for  α  = 0.01 with d.f. = 22 for a left- tailed test. Find the 0.01 column in the One tail row, and 22 in the d.f. column. The critical value is  t  = -2.508 since the test is a one-tailed left test. Find the critical value for  α  = 0.10 with d.f. = 18 for a two-tailed  test. Find the 0.10 column in the Two tails row, and 18 in the d.f. column.
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This note was uploaded on 12/09/2011 for the course STATS 221 taught by Professor Nielson during the Fall '10 term at BYU.

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Ch 8 Sec 3 - Chapter8Section3 tTestforaMean Mr.KennethHorwitz 8.3tTestforaMean normallydistributed,isunknown X t= sn

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