practice-midterm2

practice-midterm2 - STAT 20 Fall 2011 Practice Midterm 2 1...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
STAT 20 - Fall 2011 - Practice Midterm 2 1. Most explanations require just a sentence or two. On calculations, show your work and work through to a numerical answers, upto at least 2 decimal places. 2. Use the normal tables in the back of the book. 1. A researcher collects data consisting of (father’s height, son’s height) for a random sample of households in a certain city. The average height of the fathers is 69 inches and the average height of the sons is 70 inches. Both have standard deviations of 2 inches, and the correlation is 0.5. (a) Terry, one of the fathers interviewed, is taller than 38% of the fathers. In what percentile of the sons’ heights do you expect his son Weston to be? Assume the scatter plot is football-shaped. (b) The researcher wants to know the mean and standard deviation among all sons whose fathers were in the 38th percentile. What do you say? (Hint: save time by reusing your calculations from part (a).) (c) Without doing any long calculations, can you say what your answer for (a) and (b)would have been if the correlation was -0.5?
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ 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