MAS 1107 M9 Problem Set 2 Introduction to Statistics 2021

1/28/2021 M9: Problem Set 2: Introduction to Statistics- Lagios


M9: Problem Set 2
Due No due date Points 0 Questions 4 Time Limit None



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Attempt History
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LATEST Attempt 1 35 minutes 0 out of 0




Score for this quiz: 0 out of 0
Submitted Sep 21, 2020 at 1:37pm
This attempt took 35 minutes.


Question 1 pts



Find the best fit line for the following data:

x 2 3 7 10 15

y 1 8 9 11 12

(Notice that this is the same data as in problem 7 from problem set 9.1.
You may use any calculations that you did for that problem to help you
with this problem.)


Your Answer:

Sx = 5.32

Sy = 4.32

r=0.822

X= 7.4 & Y=8.2

For slope:

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https://portagelearning.instructure.com/courses/169/quizzes/6652?module_item_id=18150 1/7
https://www.coursehero.com/file/79208345/M9-Problem-Set-2-Introduction-to-Statisticspdf/

, 1/28/2021 M9: Problem Set 2: Introduction to Statistics- Lagios

y intercept:

y=mx+b=0.667x+3.2642




Notice that this is the same data that we had in problem 7 from
problem set 9.1. There we found that

x̄ = 7.4, ȳ = 8.2, Sx = 5.32, Sy = 4.32.

r= .822.

We will substitute these into the equations given above:

Slope:




Y-intercept:

b= ȳ- m x̄

b= 8.2- .667(7.4) = 3.264.

When we substitute these into the equation for the line:

y= mx+b

We get the line

y= .667x+3.264.




Question 2 pts



Find the best fit line for the following data:
This study source was downloaded by 100000832361371 from CourseHero.com on 04-15-2022 00:06:32 GMT -05:00

https://portagelearning.instructure.com/courses/169/quizzes/6652?module_item_id=18150 2/7
https://www.coursehero.com/file/79208345/M9-Problem-Set-2-Introduction-to-Statisticspdf/