Exam 1
Date: Feb. 26, 2016
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SOLUTION:
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Exam 1
Date: Feb. 26, 2016
STAT-3610
1. Suppose X1 , X2 , . . . , Xn are a random sample of size n observations from a N (, 2 ) population, where is
known but is unknown. Let = 2 , then we kn
Quiz 13
April 29, 2016
NAME: SOLUTION
Let Xi , i = 1, 2, 3, 4, equal the distance (in yards) that a golf ball travels when hit from a tee, where i denotes the
index of the ith manufacturer. We shall test the null hypothesis H0 : 1 = 2 = 3 = 4 , using the
Quiz 7
Quiz Date: Wed, March 9, 2016
NAME: SOLUTION
STAT-3610
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1. A test was conducted to determine whether a wedge on the end of a plug fitting designed to hold
a seal onto the plug was doing its job. The data taken were in the form of measu
Quiz 9 (prac2): solution
Quiz Date:
STAT-3610
NAME: SOLUTION
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1. In a certain political campaign, one candidate has a poll taken consisting of a random sample of size 351
from the voting population (an extremely large population). The results
Quiz 1 SOLUTION
Quiz Date: Jan 22, 2015
NAME:
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STAT-3610
Suppose X is an exponential random variable with mean > 0, i.e., the pdf is given as,
f (x|) =
1 x/
e
,
0 x < .
(1)
Z
1. Show that the area under the curve/density defined in (1) is equ
Quiz 6
Quiz Date: March 4, 2016
NAME: SOLUTION
STAT-3610
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1. A leakage test was conducted to determine the effectiveness of a seal designed to keep the inside of a plug
airtight. An air needle was inserted into the plug, and the plug and need
Test 2
STAT 3610
1(35 Points).
Spring 2012
Maghsoodloo
Todeterminewhethertwodifferenttypesofsteelhavethesame
processvariabilityandaveragefracturetoughness,samplesofsizesnx=8andny=11specimen
weretestedfromthetwodifferentprocesseswiththefollowingresults:
11
STAT 3610
Test 1
Spring 2010
Maghsoodloo
1(40 Points). The drying time, X, of a certain type of paint is known to be normally
distributed with a target mean value of = 75 minutes, i.e., X ~ N(75 minutes, Unknown 2).
The companys chemists have proposed a n
STAT 3610 Homework Number 7 Due on Monday April 20, 2009
At 9:00 am.
1(a,10 Points). Carefully study the Example 14.10 on pp. 582583 of Devores 7th edition. There are two errors in the authors
solution. Thus, please review very carefully. First conduct th
Final Exam
STAT 3610
Spring 2009
1(24 Points, each part worth 3 points; closed book & notes). Answer
the following statements as either True (T) or False (F). Please do not support your
choice (of T or F) and submit your answers on this very sheet and ret
Quiz 3
Quiz Date: Feb 5, 2015
NAME:
STAT-3610
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1. An Insurance company experience the following mobile home losses in 10,000s of dollars (x) for 50 catastrophe events:
1 2 2 3 3 4 4 5 5 5 5 6 7 7 9 9 9 10 11 12 22 24 28 29 31 33 36 38 38 38
3
Practice Quiz 1
Quiz Date: August 27, 2015
STAT-3610
Here is an example of the type of problem that could be on the quiz. The quiz can come from any
one of the homework or related problems, including this one.
The weekly demand for propane gas (in 1000s o
Practice Quiz 2
Quiz Date: Sep 3, 2015
NAME:
STAT-3610
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1. Suppose X is a Gamma random variable with shape parameter and scale parameter > 0, i.e., the pdf
is given as,
1
x1 ex/ , 0 < x < ,
(1)
f (x|, ) =
()
Z
where > 0, > 0 and (a) =
xa1 ex
Quiz 8: solution
Quiz Date: March 11, 2015
STAT-3610
NAME: SOLUTION
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1. In a certain political campaign, one candidate has a poll taken consisting of a random sample of size 351
from the voting population (an extremely large population). The
Exam 2
Date: April 1, 2016
Version 1
NAME: INSTRUCTORS ANSWER KEY
SCORE: 100%
STAT-3610
Exam 2
Date: April 1, 2016
STAT-3610
1. (8.1-5) Suppose that it is known that the true mean birth weight of infants in the United States is 3315 grams.
To determine if
Quiz 5
Quiz Date: Feb 19, 2016
NAME: SOLUTION
STAT-3610
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1. Suppose X1 , X2 , . . . , Xn are a random sample from a Bernoulli () population, 0 < < 1. We wish to
use the sample to estimate the parameter p, i.e., the population proportion. The
Quiz 11(SOLUTION)
Quiz Date: Apr 15, 2016
NAME: SOLUTION
STAT-3610
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1. A particular brand of candy-coated chocolate comes in five different colors that we shall denote as A1 =
cfw_brown, A2 =cfw_yellow, A3 = cfw_orange, A4 = cfw_green, and A5
Exam 2
Date: Nov 12, 2015
Version 1
NAME: SOLUTION
SCORE:
STAT-3610
Exam 2
Date: Nov 12, 2015
STAT-3610
Questions 1-10 are multiple choice, circle only one indicating your response. The multiple choice problems are
worth 2 points each.
1. Assume that the
Quiz 9 (SOLUTION)
Quiz Date: Mar 25, 2016
NAME:
STAT-3610
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1. In attempting to control the strength of the wastes discharged into a nearby river, a paper firm
has taken a number of measures. Members of the firm believe that they have reduced
Exam 2
STAT 3610
May 5, 2015
Answer Key (abbreviated solutions)
Exam 2
Wednesday, April 15, 2015
STAT-3610
1. (30pts) A random sample of soil specimens was obtained and the amount of organic matter (%) in
the soil was determined for each specimen, resulti
Quiz 4
Quiz Date: Feb 12, 2015
NAME: SOLUTION
STAT-3610
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1. Suppose X1 , X2 , . . . , Xn are a random sample from a Poisson population with mean . We wish to use the
sample to estimate the parameter .
(a) Write out the parameter space for thi
Quiz 9 (prac1) SOLUTION
NAME: SOLUTION
Quiz Date:
STAT-3610
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1. Independent random samples of the heights of adult males living in two countries yielded the following
results: n = 13, x
= 65.7 inches, sx = 4 inches and m = 15, y = 68.2 inche
Inferences about the difference of population Proportions: Sep 24, 2012 Basic Assumptions
1
1. p1 is the proportion of successes in population 1, and X the number of successes in a random sample of size m 2. p2 is the proportion of successes in population
Goodness of fit test: Nov 12 , 2012
1
Suppose in an experiment, each individual or object is classified as belonging to one of a finite number, say k, of non overlapping categories. Let pi denotes the proportion of the population belonging to category i ,
Multiple linear Regression - Inferences : Nov. 07, 2012
1
In multiple linear regression, the existence of the linear relationship between the predictors and the response variable is tested using the the hypotheses described below.
Testing Procedures 1. Hy
Multiple Linear Regression Analysis - Model and Parameters estimation: Nov. 5, 2012
1
Definition. When we have k 2 predictors in a linear regression, the model is called multiple linear regression. Such a model is given by the equation and assumption belo
Correlation: Nov. 2, 2012
1
Denition. The sample correlation coecient for n pairs of observations (x1 , y1 ), , (xn , yn ) is
the quantity
n
Sxy
i=1 (xi x)(yi y )
r=
=
n
n
Sxx Syy
2
2
i=1 (xi x)
i=1 (yi y )
It is a measure of the strength or degree of the