stat203_practice_midterm1A.pdf - STAT 203 Practice Midterm...

This preview shows page 1 - 4 out of 7 pages.

STAT 203 Practice Midterm Exam #1A (Total mark: 30) 1. The following contingency table shows the admission status and gender of applicants for the Master of Arts program in the economics and psychology departments of a national university. There are a total of 855 applicants across the two departments. Admitted Not admitted Total Male 177 226 403 Female 177 275 452 Total 354 501 855 (a) Write down the conditional distribution of gender among applicants who are ad- mitted. [2 marks] (b) What percentage of applicants being rejected are males? [1 mark] (c) True or false? (Check your answer) [1 mark] The two variables gender and admission status are independent because among those who are admitted, there is the same percentage of males and females. TRUE FALSE 1
Image of page 1

Subscribe to view the full document.

(d) Now we look at the data for the two departments separately: Economics department # admitted # applicants Admission rate Male 132 268 132/268 = 49.3% Female 75 148 75/148 = 50.7% Psychology department # admitted # applicants Admission rate Male 45 135 45/135 = 33.3 % Female 102 304 102/304 = 33.6 % Within each department, the admission rate is higher among females. However, when we combine the data from the two departments, males have a higher ad- mission rate (177/403=43.9% for males vs. 177/452=39.2% for females). Briefly explain this phenomenon. [2 marks] 2
Image of page 2
2. In an antihypertensive medication trial, patients were given either one of the active and the placebo treatments. Their blood pressures were measured at start of the study and 9 months after. The changes in blood pressure are plotted in the following two
Image of page 3

Subscribe to view the full document.

Image of page 4

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern