Statistics for the Behavioral SciencesSecond Edition

Chapter 9:

The Single-Sample t Test

iClicker Questions

Copyright © 2012 by Worth Publishers

Susan A. Nolan and Thomas E. Heinzen

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 99. 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.