IEE 380 Final Exam Questions with
Correct Answers
According to the text's notation, a residual is the difference between the __________
response and the model-predicted response. - ANSWER-actual
β0hat is the estimate of the ___________ in a simple linear regression model -
ANSWER-intercept
********
We want to do a hypothesis test on the difference between two population means and
we do not know the population variances. We do a test of hypothesis on the equality of
variances and determine that we have evidence that the variances, though unknown,
are equal. How many degrees of freedom will our test statistic have? - ANSWER-not n-
1
**************
How many values can a Poisson random variable have? - ANSWER-not 2
*******A completely randomized experiment has n _______________ for each
treatment. - ANSWER-not treatments
The coefficient of determination is a measure of the __________ of variability that can
be accounted for by the model. - ANSWER-fraction
Regarding hypothesis testing, alpha is the probability of Type I error. - ANSWER-true
*******
We want to do a hypothesis test on the difference between two population means and
we are told the population standard deviation values for each population. Which test
statistic do we use? - ANSWER-not p0
The standard error of the sample mean is sigma/sqrt(n) - ANSWER-true
********
The number of items in a population _______________. - ANSWER-not is always finite
Using the notation from the text, which of the following is analogous to "b" in the linear
model, y = mx + b? - ANSWER-β0
Using the notation given in the text, which of the following estimates the slope in a
simple linear regression model? - ANSWER-β1 hat
, You have determined L and U such that P(L < sigma1^2/sigma2^2 < U) = .95. What
number will be in the this confidence interval if you fail to reject the null hypothesis H0:
sigma1^2 = sigma2^2 ? - ANSWER-1
When reading the Excel output for a randomized complete block design, you use the p-
values in the "Columns" row if your treatments are presented in the Excel sheet in
_______ - ANSWER-columns
The number of items in a random sample is denoted as _______. - ANSWER-n
If X is the face value for the throw of a fair die, the name of the probability distribution of
X is the - ANSWER-discrete random variable
If random variable X has a/an _______________ number of values in a finite interval of
its range, X is continuous. - ANSWER-infinite
An experiment that is repeated in the same manner every time but that can result in
different outcomes is called a _______________ experiment. - ANSWER-random
what are the random variables - ANSWER-xbar, S, S^2
What letter is used to denote the number of observations in a sample? - ANSWER-n
S^2 is the ___________________ variance. - ANSWER-sample
An experiment that is repeated in the same manner every time but that can result in
different ____________ is called a random experiment. - ANSWER-outcomes
If you were asked to sketch the pdf of a normal random variable, X, you would label the
"y" axis as f(z) - ANSWER-false
**********
A rivet is to be inserted into a hole. A random sample of 15 parts is selected and the
hole diameter is measured. The sample mean is 1.2 mm and the sample standard
deviation is .008 millimeters. Is there strong evidence to indicate that the standard
deviation of hole diameter exceeds 0.01 millimeters?
What is the test statistic that will be used in the hypothesis test? - ANSWER-not p0
What letter is used to denote the number of observations in a finite population? -
ANSWER-N
If we wanted to make a histogram from a sample of 100 pieces of data, how many bins
should we have according to the text and the Rule of Thumb? - ANSWER-10
Correct Answers
According to the text's notation, a residual is the difference between the __________
response and the model-predicted response. - ANSWER-actual
β0hat is the estimate of the ___________ in a simple linear regression model -
ANSWER-intercept
********
We want to do a hypothesis test on the difference between two population means and
we do not know the population variances. We do a test of hypothesis on the equality of
variances and determine that we have evidence that the variances, though unknown,
are equal. How many degrees of freedom will our test statistic have? - ANSWER-not n-
1
**************
How many values can a Poisson random variable have? - ANSWER-not 2
*******A completely randomized experiment has n _______________ for each
treatment. - ANSWER-not treatments
The coefficient of determination is a measure of the __________ of variability that can
be accounted for by the model. - ANSWER-fraction
Regarding hypothesis testing, alpha is the probability of Type I error. - ANSWER-true
*******
We want to do a hypothesis test on the difference between two population means and
we are told the population standard deviation values for each population. Which test
statistic do we use? - ANSWER-not p0
The standard error of the sample mean is sigma/sqrt(n) - ANSWER-true
********
The number of items in a population _______________. - ANSWER-not is always finite
Using the notation from the text, which of the following is analogous to "b" in the linear
model, y = mx + b? - ANSWER-β0
Using the notation given in the text, which of the following estimates the slope in a
simple linear regression model? - ANSWER-β1 hat
, You have determined L and U such that P(L < sigma1^2/sigma2^2 < U) = .95. What
number will be in the this confidence interval if you fail to reject the null hypothesis H0:
sigma1^2 = sigma2^2 ? - ANSWER-1
When reading the Excel output for a randomized complete block design, you use the p-
values in the "Columns" row if your treatments are presented in the Excel sheet in
_______ - ANSWER-columns
The number of items in a random sample is denoted as _______. - ANSWER-n
If X is the face value for the throw of a fair die, the name of the probability distribution of
X is the - ANSWER-discrete random variable
If random variable X has a/an _______________ number of values in a finite interval of
its range, X is continuous. - ANSWER-infinite
An experiment that is repeated in the same manner every time but that can result in
different outcomes is called a _______________ experiment. - ANSWER-random
what are the random variables - ANSWER-xbar, S, S^2
What letter is used to denote the number of observations in a sample? - ANSWER-n
S^2 is the ___________________ variance. - ANSWER-sample
An experiment that is repeated in the same manner every time but that can result in
different ____________ is called a random experiment. - ANSWER-outcomes
If you were asked to sketch the pdf of a normal random variable, X, you would label the
"y" axis as f(z) - ANSWER-false
**********
A rivet is to be inserted into a hole. A random sample of 15 parts is selected and the
hole diameter is measured. The sample mean is 1.2 mm and the sample standard
deviation is .008 millimeters. Is there strong evidence to indicate that the standard
deviation of hole diameter exceeds 0.01 millimeters?
What is the test statistic that will be used in the hypothesis test? - ANSWER-not p0
What letter is used to denote the number of observations in a finite population? -
ANSWER-N
If we wanted to make a histogram from a sample of 100 pieces of data, how many bins
should we have according to the text and the Rule of Thumb? - ANSWER-10
