A researcher is interested in the relationship between breast
feeding and otitis media in the first year of life. A prospective
study is done on 703 mothers. Subjects are evaluated and followed
through their child’s first year. The results are shown in the
What is the conclusion of the hypothesis that otitis media is
the same for breast feeding children and children that do not
breast feed test if you reject when p ≤ 0.05?
What is the probability of Type I error in the above question if
you reject when p ≤ 0.05 (and the null hypothesis is true)?
Based on this hypothesis test, which children (breast-feeding
yes or breast-feeding no) have more frequent rates of otitis
How does decreasing the α level affect the probability of Type I
error? How does decreasing the α level affect the probability of
Type II error? Explain your answers.
Otitis Media Total Breast Feeding No Yes 317 Yes 197 386 No 185 201 703 Total 382 321