Sophia Introduction to Statistics Unit 4 – Milestone 4
(Below is a compilation of all questions for Unit 4 – Milestone 4. The answers are 100% correct, and it
guaranteed to earn you a perfect score in this unit. For a faster search, just hit on ctrl f on windows, or
command f on mac. Good lu...
sophia introduction to statistics unit 4 – milestone 4 below is a compilation of all questions for unit 4 – milestone 4 the answers are 100 correct
Written for
Introduction to Statistics
All documents for this subject (370)
Seller
Follow
bmm7203
Reviews received
Content preview
SOPHIA INTRODUCTION TO STATISTICS UNIT 4 - MILESTONE 4
Sophia Introduction to Statistics Unit 4 – Milestone 4
(Below is a compilation of all questions for Unit 4 – Milestone 4. The answers are 100% correct, and it
guaranteed to earn you a perfect score in this unit. For a faster search, just hit on ctrl f on windows, or
command f on mac. Good luck!)
You passed this Milestone
18 questions were answered correctly.
1
Data for length of the tail (in millimeters) and age (in days) of tadpoles is entered into a
statistics software package and results in a regression equation of ŷ = 15 - 1.5x.
What is the correct interpretation of the slope if the length of the tail is the
response variable and the age is the explanatory variable?
• The length of the tail increases by 15 millimeters, on average, when the tadpole's
age increases by 1 day.
• The length of the tail decreases by 1.5 millimeters, on average, when the tadpole's
age increases by 1 day.
• The length of the tail decreases by 15 millimeters, on average, when the tadpole's
age increases by 1 day.
• The length of the tail increases by 1.5 millimeters, on average, when the tadpole's
age increases by 1 day.
RATIONALE
When interpreting the linear slope we generally substitute in a value of 1. So we can
note that, in general, as x increases by 1 unit the slope tells us how the outcome
changes. So for this equation we can note as x (age) increases by 1 day, the
outcome (length) will decrease by 1.5 millimeters on average.
CONCEPT
Interpreting Intercept and Slope
2
Which of the following scatterplots shows an outlier in the y-direction?
,•
•
,•
•
RATIONALE
To have an outlier in the y-direction the outlier must be in the range of x data but
outside the range of y-data. This outlier is outside of the data in the y direction, lying
below all of the data.
CONCEPT
Outliers and Influential Points
3
Shawna finds a study of American men that has an equation to predict weight (in
pounds) from height (in inches): ŷ = -210 + 5.6x. Shawna's dad’s height is 72 inches and
he weighs 182 pounds.
What is the residual of weight and height for Shawna's dad?
, • 193.2 pounds
• 809.2 pounds
• -11.2 pounds
• 11.2 pounds
RATIONALE
Recall that to get the residual, we take the actual value - predicted value. So if the
actual height of 72 inches and the resulting actual weight is 182 pounds, we simply
need the predicted weight. Using the regression line, we can say:
The predicted weight is 193.2 pounds. So the residual is:
CONCEPT
Residuals
4
For ten students, a teacher records the following scores of two assessments, Quiz 1 and
Test.
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 bmm7203. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.49. You're not tied to anything after your purchase.
