STATISTICS: EXAM 3 | PRACTICE
QUESTIONS AND DETAILED ANSWERS|
GRADED A+ | GUARANTEED SUCCESS
Updated 2026 Questions and Answers | 100% Verified
Exam Prep
,A key difference between a t statistic and a z statistic is Estimated
that the standard error is _______ to compute a t statistic
The estimated standard error in the t statistic uses the Sample variance; population variance
________ to estimate the ________ when the population
variance is unknown.
Two researchers (A and B) compute a one-sample t test. Researcher B
For both tests, the standard error is the same, but the
mean difference between the sample and value stated in
the null hypothesis is smaller for Researcher A. Which test
is more likely to result in a decision to reject the null
hypothesis?
A researcher selects a sample of 16 women and asks Women found this trait to be important, and this result was significant, t(15)=8.00,
them to rate how important a sense of humor is in p<.05
someone they want a long-term relationship with. She
records scores averaging 1.6±0.8 (M±D) on a rating scale
from -3 (not important at all) to +3 (very important).
Assuming that an average score of 0 is the null
hypothesis, test whether or not women find this trait
important at a .05 level of significance.
A researcher selects a sample of 32 participants who are 31
assigned to participate in a study with one group. What
are the degrees of freedom for this test?
Which of the following explains why point estimation can Both B and C
be a useful procedure to estimate a population mean?
-It defines the range of scores within which the
population mean is likely to be contained
-The sample mean is equal to the population mean on
average
-The sample mean is an unbiased estimator of the
population mean
-Both B and C
, A researcher conducts a study measuring comparing the One-sample t test
obesity rate in a small community to the known obesity
rate in the United States. Assuming that the population
variance is unknown, what type of t test is appropriate for
this study?
A professor compares final exam scores in his psychology Two-independent sample t test
class to final exam grades in another comparable
professor's class. Assuming that the population variance
of each exam scores is unknown, what type of t test is
appropriate for analyzing differences between these
classes?
Computing a one-sample t test is appropriate when All of the above
-Participants are assigned to only one group
-The population variance is unknown
-Participants are observed one time
-All of the above
The _________ is an inferential statistic used to determine T statistic
the number of standard deviations in a t distribution that
a sample mean deviates from the mean value or mean
difference stated in the null hypothesis
Is a one-sample t test reported differently for one-tailed No, the same values are reported
and two-tailed tests?
In a sample of 28 participants, a researcher estimates the 95% CI 0.9, 2.1
95% CI for a sample with a mean of M=1.5 and an
estimated standard error (SM) of 0.3. What is the
confidence interval at this level of confidence?
You read about a study testing whether night shift One-sample t test
workers sleep the recommended 8 hours per day.
Assuming that the population variance of sleep (per day)
is unknown, what type of t test is appropriate for this
study?
QUESTIONS AND DETAILED ANSWERS|
GRADED A+ | GUARANTEED SUCCESS
Updated 2026 Questions and Answers | 100% Verified
Exam Prep
,A key difference between a t statistic and a z statistic is Estimated
that the standard error is _______ to compute a t statistic
The estimated standard error in the t statistic uses the Sample variance; population variance
________ to estimate the ________ when the population
variance is unknown.
Two researchers (A and B) compute a one-sample t test. Researcher B
For both tests, the standard error is the same, but the
mean difference between the sample and value stated in
the null hypothesis is smaller for Researcher A. Which test
is more likely to result in a decision to reject the null
hypothesis?
A researcher selects a sample of 16 women and asks Women found this trait to be important, and this result was significant, t(15)=8.00,
them to rate how important a sense of humor is in p<.05
someone they want a long-term relationship with. She
records scores averaging 1.6±0.8 (M±D) on a rating scale
from -3 (not important at all) to +3 (very important).
Assuming that an average score of 0 is the null
hypothesis, test whether or not women find this trait
important at a .05 level of significance.
A researcher selects a sample of 32 participants who are 31
assigned to participate in a study with one group. What
are the degrees of freedom for this test?
Which of the following explains why point estimation can Both B and C
be a useful procedure to estimate a population mean?
-It defines the range of scores within which the
population mean is likely to be contained
-The sample mean is equal to the population mean on
average
-The sample mean is an unbiased estimator of the
population mean
-Both B and C
, A researcher conducts a study measuring comparing the One-sample t test
obesity rate in a small community to the known obesity
rate in the United States. Assuming that the population
variance is unknown, what type of t test is appropriate for
this study?
A professor compares final exam scores in his psychology Two-independent sample t test
class to final exam grades in another comparable
professor's class. Assuming that the population variance
of each exam scores is unknown, what type of t test is
appropriate for analyzing differences between these
classes?
Computing a one-sample t test is appropriate when All of the above
-Participants are assigned to only one group
-The population variance is unknown
-Participants are observed one time
-All of the above
The _________ is an inferential statistic used to determine T statistic
the number of standard deviations in a t distribution that
a sample mean deviates from the mean value or mean
difference stated in the null hypothesis
Is a one-sample t test reported differently for one-tailed No, the same values are reported
and two-tailed tests?
In a sample of 28 participants, a researcher estimates the 95% CI 0.9, 2.1
95% CI for a sample with a mean of M=1.5 and an
estimated standard error (SM) of 0.3. What is the
confidence interval at this level of confidence?
You read about a study testing whether night shift One-sample t test
workers sleep the recommended 8 hours per day.
Assuming that the population variance of sleep (per day)
is unknown, what type of t test is appropriate for this
study?
