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Students in Physics and Chemistry a random sample was taken from 20 students in Physics, from...

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Statistics

Students in Physics and Chemistry a random sample was takenfrom 20 students in Physics, from which an average of 3 hours perweek was obtained with a deviation. typical of 2.5 hours, andanother sample of 30 independent chemistry students from theprevious one, which presented an average of 2.8 hours, with adeviation. typical 2.7h. Assuming that the weekly study hours ofthe two types of students follow a normal distribution,
(a) Calculate a 95% confidence interval for the variance ratioof weekly study hours for physics students and chemistry students.(22pts)
(b) Assuming that the variances of the hours of study aresimilar, obtain a confidence interval of 95% for the difference ofmeans of hours of study of the two types of students. (8pts)

Answer & Explanation Solved by verified expert
4.4 Ratings (611 Votes)
aWe need to construct the 95 confidence interval for the ratioof the two population variances The following sample informationis providedSample Standard Deviation 125Sample Size 120Sample Standard Deviation 227Sample Size 230The critical    See Answer
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