Exam (elaborations)
STAB22 Past Midterm solutions 03
STAB22 Past Midterm solutions 03
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Seller
Follow
Content preview
University of Toronto ScarboroughSTAB22 Midterm Examination
October 2008
For this examination, you are allowed one handwritten letter-sized
sheet of notes (both sides) prepared by you, a non-programmable,
non-communicating calculator, and writing implements.
This question paper has 12 numbered pages; before you start,
check to see that you have all the pages. There is also a signature
sheet at the front and statistical tables at the back.
This examination is multiple choice. Each question has equal
weight. On the Scantron answer sheet, ensure that you enter your
last name, first name (as much of it as fits), and student number
(in “Identification”).
Mark in each case the best answer out of the alternatives given
(which means the numerically closest answer if the answer is a
number and the answer you obtained is not given.)
Before you begin, check that the colour printed on your Scantron
sheet matches the colour of your question paper. If it does not,
get a new Scantron from an invigilator.
Also before you begin, complete the signature sheet, but sign it
only when the invigilator collects it. The signature sheet shows
that you were present at the exam.
1
, 1. There are two sets of numbers. Set A is 5, 5, 5, 5. Set B is 4, 5, 6, 7. Without doing any calculations,
what can you say about the standard deviations of the two sets of numbers?
(a) Sets A and B have about the same standard deviation.
(b) Set B has a smaller standard deviation.
(c) The only way to compare the standard deviations is to calculate them.
(d) * Set A has a smaller standard deviation.
2. What is the median of the values 7, 3, 0, 1, 6?
(a) 3.4
(b) * 3
(c) 6
(d) 0
3. A stringing machine is a device for adjusting the tension of strings in a tennis racket. Some tennis
players ask for a string tension of 65 pounds. The actual tension produced by the machine for the
rackets belonging to these players varies according to a normal distribution with mean 65 pounds
and standard deviation 2 pounds. Use this information to answer this question and the 2 following
questions.
What proportion of rackets (belonging to players asking for a string tension of 65 pounds) will have a
string tension of 67.5 pounds or more?
(a) 0.00
(b) about 0.50
(c) 1.00
(d) 0.89
(e) * 0.11
4. Using the information in Question 3, what proportion of rackets (belonging to players asking for a
string tension of 65 pounds) will have a string tension between 64 pounds and 67.5 pounds?
(a) * 0.59
(b) 0.89
(c) 0.11
(d) 0.70
(e) 0.31
5. For all rackets (belonging to players asking for a string tension of 65 pounds), there is a value x such
that 20% of rackets will have an actual string tension less than x pounds. What is x?
(a) 60.9
(b) 69.1
(c) 66.7
(d) 65
(e) * 63.3
2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller StudentUofT. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$4.34. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now