An investigator conducts a study to investigate whether there is a difference in mean PEF in children with chronic bronchitis as compared to those without. Data on PEF are collected and summarised below.
An investigator conducts a study to investigate whether there is a
difference in mean PEF in children with chronic bronchitis as compared to those without. Data on PEF are collected and summarized below. Apply the two sample t test at alpha = 0.05, with
-Calculate the t value:
-Find the p value:
-Which of the following is true? a) there is statistical evidence of a different mean PEF in children with chronic bronchitis as compared to those without. b) there is no statistical evidence of a difference in mean between the two groups.
NUMBER OF CHILDREN MEAN PEF STD DEV PEF
CHRONIC BRONCHITIS 25/281/68
NO BRONCHITIS 25/319/74
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