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1. A researcher is interested in testing whether men with beards have a different number of children than the unshaven general population. The general population has on average µ = 1.3 children. A sample of 25 bearded men was found to have an average number of children of = 1.8, with a standard deviation of 1.2. Test whether bearded men have a different number of children. Set alpha to α = .05

 

STEP 1: State your hypotheses in words (include and label both H0 and H1).    (2 points)

 

 

 

           State your hypotheses in symbols (include and label both H0 and H1). (2 points)

 

 

           

STEP 2: Set up the criteria for making a decision. That is, find the critical value.

(2 points)

 

 

 

STEP 3: Summarize the data into the appropriate test-statistic. That is, compute the t statistic.                                                                                                   (3 points)                                                                                                       

 

 

 

 

 

STEP 4: Evaluate the Null Hypothesis (Reject or Fail to reject?)              (1 point)

 

 

STEP 5: What is your conclusion?                                                              (1 point)