Susan A. Nolan and Thomas E. Heinzen
Statistics for the Behavioral Sciences
Second Edition
Chapter 9:
The Single-Sample t Test
iClicker Questions
Copyright © 2012 by Worth Publishers
Chapter 9
1. As sample size decreases, the shape of the t
distribution:
a) gets progressively narrower.
b) gets progressively wider.
c) more likely matches the z distribution.
d) is more accurate.
Chapter 9
(Answer)
1. As sample size decreases, the shape of the t
distribution:
a) gets progressively narrower.
b) gets progressively wider.
c) more likely matches the z distribution.
d) is more accurate.
Chapter 9
2. What is the difference between the z and t tests?
a) The z test uses the estimated standard error while the t
statistic uses the actual standard error of the population of
means.
b) The t test uses the estimated standard error while the z
statistic uses the actual standard error of the population of
means.
c) The z test uses the estimated standard deviation while the
t statistic uses the actual standard deviation.
d) The t test uses the estimated standard deviation while the
z statistic uses the actual standard deviation.
Chapter 9
(Answer)
2. What is the difference between the z and t tests?
a) The z test uses the estimated standard error while the t
statistic uses the actual standard error of the population of
means.
b) The t test uses the estimated standard error while the z
statistic uses the actual standard error of the
population of means.
c) The z test uses the estimated standard deviation while the
t statistic uses the actual standard deviation.
d) The t test uses the estimated standard deviation while the
z statistic uses the actual standard deviation.
Chapter 9
3. The symbol used to designate the standard deviation when
estimating from a sample is:
a) SD.
b) t.
c) s.
d) df.
Chapter 9
(Answer)
3. The symbol used to designate the standard deviation when
estimating from a sample is
a) SD.
b) t.
c) s.
d) df.
Chapter 9
4. What is the correct formula for the t statistic?
(M1-M2)
a) t = _________
N
(M – μM)
b) t = _________
SM
(μ1 – μ2)
c) t = __________
M
(M – μ)
d) t = ______
S
Chapter 9
(Answer)
4. What is the correct formula for the t statistic?
(M1-M2)
a) t = ________
N
(M – μM)
b) t = ________
SM
(μ1 – μ2)
c) t = __________
M
(M – μ)
d) t = ______
S
Chapter 9
5. A(n) ___________________ is a type of t test in which
we compare data from one sample to a population for
which we know the mean but not the standard
deviation.
a) single-sample t test
b) nonparametric t test
c) independent samples t test
d) dependent samples t test
Chapter 9
(Answer)
5. A(n) ___________________ is a type of t test in which
we compare data from one sample to a population for
which we know the mean but not the standard
deviation.
a) single-sample t test
b) nonparametric t test
c) independent samples t test
d) dependent samples t test
Chapter 9
6. The formula for degrees of freedom for a single sample t
test is:
a) df = N – 1
b) df = N+P
c) df = N – 2
d) df = dfx + dfy
Chapter 9
(Answer)
6. The formula for degrees of freedom for a single sample t
test is:
a) df = N – 1
b) df = N+P
c) df = N – 2
d) df = dfx + dfy
Chapter 9
7. According to your text book, all of the following are steps
involved in calculating a single sample t-test EXCEPT:
a) identify the populations, distribution, and assumptions.
b) calculate the z scores.
c) state the null and research hypotheses.
d) determine the critical values, or cutoffs.
Chapter 9
(Answer)
7. According to your text book, all of the following are steps
involved in calculating a single sample t-test EXCEPT:
a) identify the populations, distribution, and assumptions.
b) calculate the z scores.
c) state the null and research hypotheses.
d) determine the critical values, or cutoffs.
Chapter 9
8. Which of the following is the formula for the upper bound of
the confidence interval for a single sample t test?
a) M upper = t(sM)
b) M upper = - t(sM) + Msample
c) M upper = t(sM) + Msample
d) M upper = t(sM) - Msample
Chapter 9
(Answer)
8. Which of the following is the formula for the upper bound of
the confidence interval for a single sample t test?
a) M upper = t(sM)
b) M upper = - t(sM) + Msample
c) M upper = t(sM) + Msample
d) M upper = t(sM) - Msample
Chapter 9
9. Which of these is the correct formula for calculating
effect size for a single sample t test?
a) Cohen d = (M - µ) / s
b) M upper = t(sM) + M sample
c) T = (M - µm) / sm
d) Df – N – 1
Chapter 9
(Answer)
9. Which of these is the correct formula for calculating effect
size for a single sample t test?
a) Cohen d = (M - µ) / s
b) M upper = t(sM) + M sample
c) T = (M - µm) / sm
d) Df – N – 1
Chapter 9
10. All of the following are steps in constructing a dot plot
EXCEPT:
a) cluster the data in your data set together to
reduce the number of dots.
b) determine the lowest score and highest score of
the sample.
c) draw an x-axis and label it, including the values
from the lowest to the highest scores.
d) place a dot above the appropriate value for every
score.
Chapter 9
(Answer)
10. All of the following are steps in constructing a dot plot
EXCEPT:
a) cluster the data in your data set together to
reduce the number of dots.
b) determine the lowest score and highest score of
the sample.
c) draw an x-axis and label it, including the values
from the lowest to the highest scores.
d) place a dot above the appropriate value for every
score.