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[solution]: After watching Krugman's video this week, do you concur with


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  1. An investigator conducts a study to investigate whether mean peak expiratory flow (PEF) is lower in children with chronic bronchitis as compared to those without.  Data on PEF are collected and summarized below.  Based on the data, is there statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without?  Run the appropriate test at a=0.05.  

     

    Group

    Number of Children

    Mean PEF

    Std Dev PEF

    Chronic Bronchitis

    25

    281

    68

    No Chronic Bronchitis

    25

    319

    74


    What are the null and alternative hypotheses?
    1. Ho: µ1 = µ2 vs. H1: µ1 ? µ2
    2. Ho: µ1 = µ2 vs. H1: µ1 < µ2
    3. Ho: µd = 0 vs. H1: µd ? 0
    4. Ho: p=0.5 vs. H1: p>0.5

1 points   


QUESTION 6
  1. What is the appropriate test statistic for #5?
    1. matched z-test
    2. independent samples z-test
    3. matched t-test
    4. independent samples t-test
    5. chi-square test of independence

1 points   


QUESTION 7
  1. You compute the test statistic for the above study and find that the probability of obtaining a value this large is less than .05. What is your decision?



Q

 

1. An investigator conducts a study to investigate whether mean peak expiratory flow (PEF) is lower

 

in children with chronic bronchitis as compared to those without. Data on PEF are collected...

 


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