Statistics for the Behavioral Sciences Second 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? (M 1 -M 2 ) a) t = _________ N (M – μ M ) b) t = _________ S M (μ1 – μ2) c) t = __________ M (M – μ) d) t = ______ S

Chapter 9 (Answer) 4. What is the correct formula for the t statistic? (M 1 -M 2 ) a)t = ________ N (M – μ M ) b) t = ________ S M (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 = df x + df y

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 = df x + df y

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(s M ) b) M upper = - t(s M ) + M sample c) M upper = t(s M ) + M sample d) M upper = t(s M ) - M sample

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(s M ) b) M upper = - t(s M ) + M sample c) M upper = t(s M ) + M sample d) M upper = t(s M ) - M sample

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(s M ) + M sample c) T = (M - µ m ) / s m 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(s M ) + M sample c) T = (M - µ m ) / s m d) Df – N – 1

Chapter 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.