## [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?

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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...

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