IEE 380 Final Exam Questions with Correct Answers QUESTIONS WITH 100%
CORRECT ANSWERS/A+ GRADE
(Xbar-mu)/(sigma/sqrt(n)) has what probability distribution? - ✔✔Standard
Normal
******
We want to do a hypothesis test on the difference between proportions from
two populations. Which test statistic do we use? - ✔✔not delta0
******
xbar is an estimate of ______________ - ✔✔not the sample mean
*******
A hypothesis test on a ___________________uses the normal approximation to
the binomial distribution. - ✔✔not mean
*******
Type I error is __________________ - ✔✔the condition of failing to reject H0
when H0 is 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? - ✔✔not p0
********
,F(x) is equal to ______________ - ✔✔not P(X=x)
********
If we want to use ANOVA to determine the significance of regression hypothesis
test conclusion, which test statistic would we determine? - ✔✔not t0
********
Let x (lowercase) denote a specific measured numerical value of a random
variable. How do we denote this random variable? That is, what is the notation
of the random variable? - ✔✔not p(X=x)
********
Select the TRUE statement: - ✔✔not Residuals are always >= 0
********
Suppose the number of people who cross on a green light at Rural and
University (going south) is a Poisson random variable, X, with a mean equal to
12 people. What is the variance of X? - ✔✔not 1/12 people^2
********
Suppose we have to decide if a part is good or bad and we have 20 of these
parts. If X is the number of parts that are good out of the 20 that we have, then
X has the _____________ probability distribution. - ✔✔not poisson
********
, The entry in the Z table (CDF of a standard normal random variable)
corresponding to a row label of 1.2 and a column label of .03 is - ✔✔not p(1.23)
********
The number of items in a population _______________. - ✔✔not is always finite
********
The number of items in a sample _______________. - ✔✔not is given by the
letter N
********
Two catalysts may be used in a batch chemical process. Twelve batches were
prepared using catalyst 1, resulting in an average yield of 85 and a sample
standard deviation of 4. Fifteen batches were prepared using catalyst 2, and
they resulted in an average yield of 91 with a standard deviation of 2. Is there
evidence to support the claim that catalyst 2 produces higher mean yield than
catalyst 1?
Which test statistic will be used in the hypothesis test that will be performed? -
✔✔not p0
********
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? - ✔✔not n-1
CORRECT ANSWERS/A+ GRADE
(Xbar-mu)/(sigma/sqrt(n)) has what probability distribution? - ✔✔Standard
Normal
******
We want to do a hypothesis test on the difference between proportions from
two populations. Which test statistic do we use? - ✔✔not delta0
******
xbar is an estimate of ______________ - ✔✔not the sample mean
*******
A hypothesis test on a ___________________uses the normal approximation to
the binomial distribution. - ✔✔not mean
*******
Type I error is __________________ - ✔✔the condition of failing to reject H0
when H0 is 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? - ✔✔not p0
********
,F(x) is equal to ______________ - ✔✔not P(X=x)
********
If we want to use ANOVA to determine the significance of regression hypothesis
test conclusion, which test statistic would we determine? - ✔✔not t0
********
Let x (lowercase) denote a specific measured numerical value of a random
variable. How do we denote this random variable? That is, what is the notation
of the random variable? - ✔✔not p(X=x)
********
Select the TRUE statement: - ✔✔not Residuals are always >= 0
********
Suppose the number of people who cross on a green light at Rural and
University (going south) is a Poisson random variable, X, with a mean equal to
12 people. What is the variance of X? - ✔✔not 1/12 people^2
********
Suppose we have to decide if a part is good or bad and we have 20 of these
parts. If X is the number of parts that are good out of the 20 that we have, then
X has the _____________ probability distribution. - ✔✔not poisson
********
, The entry in the Z table (CDF of a standard normal random variable)
corresponding to a row label of 1.2 and a column label of .03 is - ✔✔not p(1.23)
********
The number of items in a population _______________. - ✔✔not is always finite
********
The number of items in a sample _______________. - ✔✔not is given by the
letter N
********
Two catalysts may be used in a batch chemical process. Twelve batches were
prepared using catalyst 1, resulting in an average yield of 85 and a sample
standard deviation of 4. Fifteen batches were prepared using catalyst 2, and
they resulted in an average yield of 91 with a standard deviation of 2. Is there
evidence to support the claim that catalyst 2 produces higher mean yield than
catalyst 1?
Which test statistic will be used in the hypothesis test that will be performed? -
✔✔not p0
********
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? - ✔✔not n-1
