age 1 of 87
ISYE6644 MIDTERM 1 ,2 & FINAL EXAM PREP
2025/2026 ACCURATE QUESTIONS WITH CORRECT
DETAILED ANSWERS || 100% GUARANTEED PASS
BRAND NEW VERSION
Why can't we use a z-test in place of a one-sample t-test?
.......Answer.........As we do not know the value of σ, estimating it
from s will introduce some error in the calculation. This will
change the shape of the sample distribution of the mean. It will
no longer be z distributed. Instead, it follows the t distribution.
Explain Longitudinal Study (Development Design)
.......Answer.........The same group of people is observed at
different points as they grow older
,age 2 of 87
What are the problems with longitudinal development designs?
.......Answer.........Expensive and time consuming, larger drop-out
(attrition) rate, stuck with questions designed years ago
Explain Cross-Sectional Study (Development Designs)
.......Answer.........People of different ages are studied at only
one point in time
The ______ test is used to compare a group mean to a
population norm. .......Answer.........One-Sample t-Test
As the degrees of freedom increase, the t-distribution becomes
slightly less squished. At infinite degrees of freedom, it is exactly
the same as the ______. .......Answer.........Normal Distribution
Why would you use a dependent sample t-test?
.......Answer.........When comparing people to themselves (e.g.,
,age 3 of 87
scores on a pre-test and a post-test), or comparing some other
matched pair (e.g., comparing brothers and sisters).
Why would you use an independent samples t-test?
.......Answer.........To see if the mean of two independent groups
are significantly different from each other.
List the assumptions made for Independent Sample t-tests.
.......Answer.........Independent Groups, Normality of Dependent
Variable, and Homogeneity of Variance.
Explain Independent Groups. .......Answer.........Participants in
each group must be different, a between-subject design.
If participants are in both groups (a within-subject design), what
t-test would you use? .......Answer.........Dependent Sample t-test
, age 4 of 87
Explain Homogeneity of Variance .......Answer.........The variance
of the two groups will be equal or approximately equal.
Explain Normality of Dependent Variable. .......Answer.........The
sample dependent variable should be normally distributed
______ is more conservative and is less likely to result in Type I
error. .......Answer.........Non-directional (Two-tailed) test
______ is more liberal and more likely to result in Type I error.
.......Answer.........Directional (One-tailed) test
Which test (one or two tailed) should you use (unless you have a
compelling reason to do otherwise)? .......Answer.........Non-
directional (two-tailed)
Correlation Coefficient of Effect Size varies from ______ to
______ and is not used very often. .......Answer.........0 to 1
ISYE6644 MIDTERM 1 ,2 & FINAL EXAM PREP
2025/2026 ACCURATE QUESTIONS WITH CORRECT
DETAILED ANSWERS || 100% GUARANTEED PASS
BRAND NEW VERSION
Why can't we use a z-test in place of a one-sample t-test?
.......Answer.........As we do not know the value of σ, estimating it
from s will introduce some error in the calculation. This will
change the shape of the sample distribution of the mean. It will
no longer be z distributed. Instead, it follows the t distribution.
Explain Longitudinal Study (Development Design)
.......Answer.........The same group of people is observed at
different points as they grow older
,age 2 of 87
What are the problems with longitudinal development designs?
.......Answer.........Expensive and time consuming, larger drop-out
(attrition) rate, stuck with questions designed years ago
Explain Cross-Sectional Study (Development Designs)
.......Answer.........People of different ages are studied at only
one point in time
The ______ test is used to compare a group mean to a
population norm. .......Answer.........One-Sample t-Test
As the degrees of freedom increase, the t-distribution becomes
slightly less squished. At infinite degrees of freedom, it is exactly
the same as the ______. .......Answer.........Normal Distribution
Why would you use a dependent sample t-test?
.......Answer.........When comparing people to themselves (e.g.,
,age 3 of 87
scores on a pre-test and a post-test), or comparing some other
matched pair (e.g., comparing brothers and sisters).
Why would you use an independent samples t-test?
.......Answer.........To see if the mean of two independent groups
are significantly different from each other.
List the assumptions made for Independent Sample t-tests.
.......Answer.........Independent Groups, Normality of Dependent
Variable, and Homogeneity of Variance.
Explain Independent Groups. .......Answer.........Participants in
each group must be different, a between-subject design.
If participants are in both groups (a within-subject design), what
t-test would you use? .......Answer.........Dependent Sample t-test
, age 4 of 87
Explain Homogeneity of Variance .......Answer.........The variance
of the two groups will be equal or approximately equal.
Explain Normality of Dependent Variable. .......Answer.........The
sample dependent variable should be normally distributed
______ is more conservative and is less likely to result in Type I
error. .......Answer.........Non-directional (Two-tailed) test
______ is more liberal and more likely to result in Type I error.
.......Answer.........Directional (One-tailed) test
Which test (one or two tailed) should you use (unless you have a
compelling reason to do otherwise)? .......Answer.........Non-
directional (two-tailed)
Correlation Coefficient of Effect Size varies from ______ to
______ and is not used very often. .......Answer.........0 to 1
