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Exercises 9.101-9.106 pertain to P-values for a one-mean t-test. For each exercise, do the following tasks,

a. Use Table IV in Appendix A to estimate the P-value,

b. Based on your estimate in part (a), state at which significance levels the null hypothesis can be rejected, at which significance levels it cannot be rejected, and at which significance levels it is not possible to decide:

Two-tailed test, n=17and t=-2.733

Short Answer

Expert verified

Part (a):

0.01<P<0.02

Part(b):

We can reject H0, at any significance level of 0.02 or larger, and cannot reject H0, at any significance level of 0.01or smaller. For significance levels between 0.01 and 0.02, table-IV is not sufficiently detailed to help us to decide whether to reject H0.

Step by step solution

01

Step 1. Given information is: 

Two-tailed test, n=17andt=-2.733

02

Part (a) Step 1. Estimating P-value

Becausethetestistwo-tailed,theP-value(P)istheareaunderthet-curvewithdf=17-1=16thatlieseithertotheleftofthe-2.733ortotherightof2.733Becauset-curveissymmetricabout0,sotheareatotheleftof-2.733equalstotheareatotherightof2.733.Inthedf=16rowofthetable-IV,thetwot-valuesthatstraddle2.733aret0.01=2.583andt0.005=2.921.Thereforetheareaunderthetcurvethatliestotherightof2.733isbetween0.005and0.01.Consequently,theareaunderthet-curvethatliestotheleftoft0=-2.733isalsobetween0.005and0.01.Thereforetheareaunderthetcurvethatlieseithertotheleftof-2.733ortotherightof2.733isbetween0.01and0.02.Hence,0.01<P<0.02

03

Part (b) Step 1. Calculating Significance Levels

WecanrejectH0,atanysignificancelevelof0.02orlarger,andcannotrejectH0,atanysignificancelevelof0.01orsmaller.Forsignificancelevelsbetween0.01and0.02,table-IVisnotsufficientlydetailedtohelpustodecidewhethertorejectH0.

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