The following data come from a study designed to investigate drinkin

#1 The following data come from a study designed to investigate drinkin problems among college students. In 1983, a group of students were asked whether they had ever driven an automobile while drinking. In 1987, after the legal drinking age was raised, a different group of college students were asked the same question.
Year
Drove While Drinking 1983 1987 Total
Yes 1250 991 2241
No 1387 1666 3053
Total 2637 2657 5294
a.) Use the chi-square test to evaluate the null hypothesis that the population proportions of students who drove while drinking are the same in the two calendar years.
b.) What do you conclude about the behavior of college students?
c.) Again test the null hypothesis that the proportions of students who drove while drinking are identical for the two calendar years. This time, use the method based on the normal approximation to the binomial distribution that was presented in Section 14.6 (comparisons of two porportions-stata) Do you reach the same conclusion?
d.) Construct a 95% confidence interval for the true difference in population proportions.
e.) Does the 95% confidence interval contain the value 0? Would you have expected that it would?

#2
A group of children five years of age and younger who were free of respiratory problems were enrolled in a cohort study examining the relationship between parental smoking and the subsequent development of asthma. The association between maternal cigarette smoking status and a diagnosis of asthma before the age of twelve was examined separately for boys and for girls.
Gender Smoking Status Asthma Diagnosis Total
Yes No
Boys> ½ pack/day 17 63 80
< ½ pack/day 41 274 315
Total 58 337 395

Girls > ½ pack/day 8 55 63
< ½ pack/day 20 261 281
Total 28 316 344
a.) Estimate the relative odds of developing asthma for boys whose mothers smoke at least one-half pack of cigarettes per day versus those whose mothers smoke less than this.
b.) Estimate the corresponding odds ratio for girls.
c.) Conduct a test of homogeneity to determine whether it is appropriate to combine the information in the two 2×2 tables using the Mantel-Haenszel method. What do you conclude?
d.) If it makes sense to do so, find a point estimate for the summary odds ratio and construct a 95% confidence interval.
e.) What would you do if the results of the test of homogeneity led you to reject the null hypothesis that the odds ratio is identical for boys and girls?

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more