1|Page
IEE 380 EXAM 2 QUESTIONS AND ANSWERS
2025
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
,2|Page
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
,3|Page
S^2 is the ___________________ variance. -
...ANSWER... ✔ ✔sample
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
, 4|Page
*******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
IEE 380 EXAM 2 QUESTIONS AND ANSWERS
2025
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
,2|Page
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
,3|Page
S^2 is the ___________________ variance. -
...ANSWER... ✔ ✔sample
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
, 4|Page
*******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
