Following is a portion of the computer output for a regression analysis relating y = number of people who use the public pool to x = the outside temperature.
Predictor Coef
Constant 57.912
Temp 0.81138
Predict approximately how many people will use the public pool in a day when the temperat...
QMB 3200 EXPECTED QUESTIONS
AND THEIR ANSWERS
Following is a portion of the computer output for a regression
analysis relating y = number of people who use the public pool
to x = the outside temperature.
Predictor Coef
Constant 57.912
Temp 0.81138
Predict approximately how many people will use the public
pool in a day when the temperature is 90 degrees?
y = 57.912 + .81138 (90) = 131
An F test, based on the F probability distribution, can be used
to test for?
Significance in regression
The following data show the results of an aptitude test and
the grade point average of 10 students.
If GPA and Aptitude Test Scores are linearly related, which of
the following must be true?
β1 ≠ 0
-only if x and y are linearly related
,The value of the coefficient of correlation (r)?
can be equal to the value of the coefficient of determination
(r2)
The tests of significance in regression analysis are based on
assumptions about the error term ɛ. One such assumption is
that the values of ɛ are?
Independent
In regression analysis, the equation in the form y = 𝛽0 + 𝛽1x +
ε is called the?
Regression Model
If a residual plot of x versus the residuals, y - ŷ, shows a non-
linear pattern, then we should conclude that?
The regression model is not an adequate representation of the
relationship between the variables
In a regression analysis, if SSE = 200 and SSR = 300, then the
coefficient of determination is?
r2 = SSR/(SSE + SSR)
= 300/(200 + 300) = .6
The following data represent a company's yearly sales volume
and its advertising expenditure over a period of 8 years.
Use the least squares method to develop the estimated
regression equation.
, y= -10.42 +.79x
The tests of significance in regression analysis are based on
several assumptions about the error term ɛ. Additionally, we
make an assumption about the form of the relationship
between x and y. We assume that the relationship between x
and y is?
Linear
The difference between the observed value of the dependent
variable and the value predicted using the estimated
regression equation is called a(n)?
Residual
Suppose a residual plot of x verses the residuals, y - ŷ, shows a
nonconstant variance. In particular, as the values of x increase,
suppose that the values of the residuals also increase. This
means that?
As the values of x get larger, the ability to predict y becomes
less accurate
The coefficient of determination?
Cannot be negative
When studying the relationship between two quantitative
variables, an interval estimate of the mean value of y for a
given value of x is called a(n)?
Confidence Interval
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 AcademicSuperStore. 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.
