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Exam (elaborations)

QMB 3200 – Exam 3 Questions and Correct Answers (Latest Update 2025–2026, Already Graded A+)

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This document features the most recent and verified version of QMB 3200 Exam 3 Questions and Correct Answers, updated for the 2025–2026 academic year. It covers advanced statistical analysis topics from the University of Central Florida’s (UCF) Business Statistics course, including simple and multiple linear regression, correlation, residual analysis, model selection, and time series forecasting. Each problem is presented with precise calculations, interpretations, and correct answers based on real QMB 3200 exam formats. Ideal for students seeking an A+ level understanding of statistical modeling and data-driven business decisions.

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Uploaded on
October 9, 2025
Number of pages
22
Written in
2025/2026
Type
Exam (elaborations)
Contains
Questions & answers

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Page |1
y y y yy y




QMB 3200 Exam 3 Questions and
Correct Answers/ Latest
AUpdate
graph of the /
y Already
standardized y Graded
residuals plotted against valu
y y y y y y


es of the normal scores that helps to determine whether th
y y y y y y y y y y


e assumption that the error term has a normal probability d
y y y y y y y y y y


istribution appears to be valid is called a:
y y y y y y y




Ans: normal probability plot
y y y




The tests of significance in regression analysis are based o
y y y y y y y y y


n assumptions about the error term ɛ . One such assumpti
y y y y y y y y y y


on is that the variance of ɛ, denoted by 𝝈2, is:
y y y y y y y y y y




Ans: the same for all values of x
y y y y y y y




identify independent and dependent variables between ad
y y y y y y


vertising and sales y y




Ans: The independent variable is the advertising expe
y y y y y y y


nses, and the dependent variable is sales.
y y y y y y




In regression analysis, the variable that is being predicted is t
y y y y y y y y y y


he:

Ans: dependent variable
y y




All rights reserved © 202
y y y y


5/ 2026 |
y y

, Page |2
y y y yy y




The tests of significance in regression analysis are based
y y y y y y y y y


on assumptions about the error term ɛ. One such assump
y y y y y y y y y


tion is that the error term follows ɛ a(n)
y y y y y y y y y


distribution for all values of x y y y y y




Ans: normaly




Influential observations always:
y y




Ans: none of the above
y y y y




When studying the relationship between two quantitative v
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ariables, an interval estimate of the mean value of y for a gi
y y y y y y y y y y y y


ven value of x is called a(n):
y y y y y y




Ans: confidence interval
y y




When constructing a confidence or a prediction interval to
y y y y y y y y y


quantify the relationship between two quantitative variabl
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es, the appropriate degrees of freedom are:
y y y y y y




Ans: n-2 y




The value of the coefficient of correlation (r):
y y y y y y y




Ans: can be equal to the value of the coeffi cient of det
y y y y y y y y y y y


ermination (r2). y




All rights reserved © 2025/ 2026 |
y y y y y y

, Page |3 y y y yy y




An F test, based on the F probability distribution, can be us
y y y y y y y y y y y


ed to test for:
y y y




Ans: significance in regression
y y y




The coefficient of determination:
y y y




Ans: cannot be negative y y y




The mathematical equation relating the independent varia
y y y y y y


ble to the expected value of the dependent variable, , is kn
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own as the: y y




Ans: regression equation y y




Suppose a residual plot of x verses the residuals, y -
y y y y y y y y y y


ŷ, shows a non-
y y y y


constant variance. In particular, as the values of x incre
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ase, suppose that the values of the residuals also increa
y y y y y y y y y


se. This means that:
y y y




Ans: as the values of x get larger, the ability to predict
y y y y y y y y y y y


y y becomes less accurate.
y y y




An observation that has a strong influence or effect on the r
y y y y y y y y y y y


egression results is called a(n): y y y y




Ans: influential observation
y y

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