{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

2010 Midterm Key - AMS110.02 Midterm(Spring 2010 Possible...

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

View Full Document Right Arrow Icon
AMS110.02 Midterm (Spring 2010) Possible Points:100; Time: 80 Minutes Last Name: _____________________ First Name: _____________________ Student ID Number: _____________________ 1. As part of a classic experiment on mutations, eight aliquots of identical size were taken from the same culture of the bacterium E. coli. For each aliquot, the number of bacteria resistant to a certain virus was determined. The results were as follows: 14, 15, 13, 21, 15, 14, 26, 20 a. (5 points) Compute the sample mean, sample variance, sample standard deviation, and sample range(to 2 decimal places) Sample mean = 17.25 Sample variance = 21.07 Sample standard deviation =4.59 Sample range = 26-13=13 b. (5 points) Give the five-number summary (min, max, median, quartiles) and IQR for this distribution. Min=13, Max=26, Median=15, First quartiles=14, Third quartiles=20.5 IQR=20.5-14=6.5 c. (5 points) Find the mode of this data set. 14 & 15 (Bimodal) d. (5 points) Find the sample coefficient of variation. (to 2 decimal places) 4.59 100% 100% 26.60% 17.25 s CV x = = = e. (5 points) Compute the 80 th percentile for this data set. 80 th percentile => n=8 and p=.8 = ( 1) n p + th order statistic = 7.2th order statistic 7th order statistic is 21 and 8 th order statistic is 26. Thus 7.2th order statistic is 21 5 20% + =22.
Image of page 1

Info icon This 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