Hypothesis1111111 - 7/7/11 One-Sample Tests of Hypothesis...

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Unformatted text preview: 7/7/11 One-Sample Tests of Hypothesis GOALS When you have completed this chapter, you will be able to: ONE Define a hypothesis and hypothesis testing. TWO Describe the five step hypothesis testing procedure. THREE Distinguish between a one-tailed and a two-tailed test of hypothesis. FOUR 7/7/11 GOALS When you have completed this chapter, you will be able to: FIVE Conduct a test of hypothesis about a population proportion. SIX Define Type I and Type II errors. One-Sample Tests of Hypothesis What is a Hypothes Twenty percent of all customers at Bovines Chop House return for another meal within a month. What is a Hypothesis? A statement about the value of a population parameter developed for the purpose of testing. The mean monthly income for systems analysts is $6,325. 7/7/11 What is Hypothesis Testing? Hypothesis testing Based on sample evidence and probability theory Used to determine whether the hypothesis is a reasonable statement and should not be rejected, or is unreasonable and should be rejected Hypothesis Do not reject nul l Re ject nul l and acc ept alterna te St ep 5: Tak e a sam ple, arrive at a dec ision St ep 4: For mu late a dec ision rule St ep 3: Iden tify the test stat istic St ep 2: Se lect a level of sign ificanc e St ep 1: St ate nul l and alterna te hyp othe ses 7/7/11 Alternative Hypothesis H 1: A statement that is accepted if the sample data provide evidence that the null hypothesis is false Null Hypothesis H A statement about the value of a population parameter Step One: State the null and alternate hypotheses 7/7/11 Three possibiliti es regarding means H 0: = H 1: = H 0: < H 1: > H 0: > H 1: < Step One: State the null and alternate hypotheses The null hypothesis always contains equality. 3 7/7/11 Step Two: Select a Level of Significance The probabilit y of re je ct ing t he null hypot he sis w he n it is act ually t rue ; t he le ve l of risk in so doing. Re je ct ing t he null hypot he sis w he n it is act ually t rue ( 29 . Acce pt ing t he null hypot he sis w he n it is act ually false ( 29 . Le ve l of Significance Type I Error Type II Error 7/7/11 St e p Tw o: Se le ct a Le ve l of Significa nce . Researcher Null Accepts Rejects Hypothesis Ho Ho Ho is true Ho is false Correct decision Type I error ( 29 Type II Error ( 29 Correct decision Risk t able 7/7/11 Step Three: Select the test A value , de t e rm ine d from sam ple inform at ion, use d t o de t e rm ine w he t he r or not t o re je ct t he null hypot he sis....
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Hypothesis1111111 - 7/7/11 One-Sample Tests of Hypothesis...

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