Publisher is interested in the effects of sales of college textsthat include more than 100 data files. The Publisher plans toproduce 20 texts in the business area and randomly chooses 10 tohave more than 100 fileas. The remaining 10 are produced with atmost 100 files. For those with mıre than 100, first-year salesaveraged 9254 and the sampel standard deviation was 2107. Fort heboks with at most 100 files, average first-year sales were 8167,and sample standard deviation was 1681. Assuming the two populationdistributions are normal, test the null hypothesis that thepopulation variances are equal against the alternative that thepopulation variance is higher for books with more than 100files.
For this problem clearly state the
a) null and alternative hypothesis,
b) decision rule and
c) conclusion.
