Class notes
stats example2
- Course
- Institution
Lecture notes of 8 pages for the course Statistics at UCalgary (pt2 examples)
[Show more]
Seller
Follow
benjaminodei
Content preview
Benjamin Odei F2021STAT213Assignment 6 is due on Monday, November 29, 2021 at 11:59pm.
The number of attempts available for each question is noted beside the question. If you are having trouble figuring out your error, you
should consult the textbook, or ask a fellow student, one of the TA’s or your professor for help.
There are also other resources at your disposal, such as the Mathematics Continuous Tutorials. Don’t spend a lot of time guessing – it’s
not very efficient or effective.
Make sure to give lots of significant digits for (floating point) numerical answers. For most problems when entering numerical answers,
you can if you wish enter elementary expressions such as 2 ∧ 3 instead of 8, sin(3 ∗ pi/2)instead of -1, e ∧ (ln(2)) instead of 2, (2 +
tan(3)) ∗ (4 − sin(5)) ∧ 6 − 7/8 instead of 27620.3413, etc.
Problem 1. (1 point) Problem 2. (1 point)
Match the correlation coefficients with their scatterplots. Select The amounts of 6 restaurant bills and the corresponding amounts
the letter of the scatterplot below which corresponds to the corre- of the tips are given in the below. Assume that bill amount is the
lation coefficient. (Click on image for a larger view.) explanatory variable and tip amount the response variable.
? 1. r = −0.74 Bill 52.44 32.98 64.30 106.27 70.29 49.72
? 2. r = 0.76 Tip 7.00 4.50 7.70 16.00 10.00 5.28
? 3. r = 0.22
? 4. r = −0.97 (a) Find the correlation: r =
(b) Does there appear to be a significant correlation?
• A. Yes
• B. No
(c) The regression equation is ŷ = .
A B C D
Answer(s) submitted: (d) If the amount of the bill is $90, the best prediction for the
• amount of the tip is $ .
• Note: Enter your answer as a number xx.xx
•
• (e) According to the regression equation, for every $10 increase
(incorrect) in the bill, the tip should (Enter INCREASE or DE-
CREASE) by $ .
Answer(s) submitted:
•
•
•
•
•
•
(incorrect)
1
, Problem 3. (1 point)
Match the following sample correlation coefficients with the ex-
planation of what that correlation coefficient means. Type the
correct letter in each box.
1. r = .1
2. r=0
3. r = −.97
4. r = −1
A. a weak positive relationship between x and y
B. a strong negative relationship between x and y
C. no relationship between x andy
D. a perfect negative relationship between x and y
Answer(s) submitted:
•
•
•
•
(incorrect)
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 benjaminodei. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
56326 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now