IEE380 FINAL EXAM 2025/2026
QUESTIONS AND ANSWERS 100% PASS
Using the notation from the text, which of the following is analogous to "b" in the linear model,
y = mx + b? - ANS β0
Using the notation given in the text, which of the following estimates the slope in a simple
linear regression model? - ANS 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 ? - ANS 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 _______ -
ANS columns
The number of items in a random sample is denoted as _______. - ANS n
If X is the face value for the throw of a fair die, the name of the probability distribution of X is
the - ANS discrete random variable
If random variable X has a/an _______________ number of values in a finite interval of its
range, X is continuous. - ANS infinite
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,An experiment that is repeated in the same manner every time but that can result in different
outcomes is called a _______________ experiment. - ANS random
what are the random variables - ANS xbar, S, S^2
What letter is used to denote the number of observations in a sample? - ANS n
S^2 is the ___________________ variance. - ANS sample
According to the text's notation, a residual is the difference between the __________ response
and the model-predicted response. - ANS actual
β0hat is the estimate of the ___________ in a simple linear regression model - ANS 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? - ANS not n-1
**************
How many values can a Poisson random variable have? - ANS not 2
*******A completely randomized experiment has n _______________ for each treatment. -
ANS not treatments
The coefficient of determination is a measure of the __________ of variability that can be
accounted for by the model. - ANS fraction
Regarding hypothesis testing, alpha is the probability of Type I error. - ANS true
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, *******
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? - ANS not p0
The standard error of the sample mean is sigma/sqrt(n) - ANS true
********
The number of items in a population _______________. - ANS not is always finite
An experiment that is repeated in the same manner every time but that can result in different
____________ is called a random experiment. - ANS outcomes
If you were asked to sketch the pdf of a normal random variable, X, you would label the "y" axis
as f(z) - ANS 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? - ANS not p0
What letter is used to denote the number of observations in a finite population? - ANS 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? - ANS 10
alpha is - ANS the probability of Type I error
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
QUESTIONS AND ANSWERS 100% PASS
Using the notation from the text, which of the following is analogous to "b" in the linear model,
y = mx + b? - ANS β0
Using the notation given in the text, which of the following estimates the slope in a simple
linear regression model? - ANS 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 ? - ANS 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 _______ -
ANS columns
The number of items in a random sample is denoted as _______. - ANS n
If X is the face value for the throw of a fair die, the name of the probability distribution of X is
the - ANS discrete random variable
If random variable X has a/an _______________ number of values in a finite interval of its
range, X is continuous. - ANS infinite
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
,An experiment that is repeated in the same manner every time but that can result in different
outcomes is called a _______________ experiment. - ANS random
what are the random variables - ANS xbar, S, S^2
What letter is used to denote the number of observations in a sample? - ANS n
S^2 is the ___________________ variance. - ANS sample
According to the text's notation, a residual is the difference between the __________ response
and the model-predicted response. - ANS actual
β0hat is the estimate of the ___________ in a simple linear regression model - ANS 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? - ANS not n-1
**************
How many values can a Poisson random variable have? - ANS not 2
*******A completely randomized experiment has n _______________ for each treatment. -
ANS not treatments
The coefficient of determination is a measure of the __________ of variability that can be
accounted for by the model. - ANS fraction
Regarding hypothesis testing, alpha is the probability of Type I error. - ANS true
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, *******
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? - ANS not p0
The standard error of the sample mean is sigma/sqrt(n) - ANS true
********
The number of items in a population _______________. - ANS not is always finite
An experiment that is repeated in the same manner every time but that can result in different
____________ is called a random experiment. - ANS outcomes
If you were asked to sketch the pdf of a normal random variable, X, you would label the "y" axis
as f(z) - ANS 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? - ANS not p0
What letter is used to denote the number of observations in a finite population? - ANS 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? - ANS 10
alpha is - ANS the probability of Type I error
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
