Quiz 1.2- Indpendent Samples (T-test)

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University of South Australia *

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2019

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Statistics

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Apr 3, 2024

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Uploaded by mjcat1-2008

Quiz 1.2 (Independent Samples t-test) Question 1 Correct Mark 1.00 out of1.00 ¥ Flag question Question 2 Correct Mark 1.00 out of1.00 ¥ Flag question Has the assumption of normality been met? Select one: d. Yes, because skew and kurtosis are not more than: 3.3 times their standard error. No, because skew and kKurtosis are not more than: 3.3 times their standard error for the Total; 3.3 times their standard error for the males; 2 times their standard error for the females. Yes, because skew and kurtosis are not more than: 3.3 v Correct times their standard error for the Total; 3.3 times their standard error for the males; 2 times their standard error for the females. No, because skew and kurtosis are more than: 3.3 times their standard error for the Total; 3.3 times their standard error for the males; 2 times their standard error for the females. Is it appropriate to conduct an Independent Samples t-test? Select one: d. No, because although the data are parametric, the assumption of normality has not been met. Yes, because the data are nonparametric and the assumption of normality has been met. No, because the data are parametric and the assumpition of normality has been met. Yes, because the data are parametric and the assumption ¥ Correct of normality has been met.

Question 3 If the assumptions were not met, what alternative test could you conduct to test Corect this hypothesis? Mark 100 out or1.00 Select one: v Flag a. Median auestion b, Wilcoxon Matched Pairs test Mann-Whitney U test v Correct d. One sample t-test Question & Looking at the Belligerence means for the Males and Females, which of the Correct following is true? Mark 100 out or100 Select one: v lag a. As predicted, the Females have scored higher on v correct et Belligerence than the Males. b, As predicted, the Males have scored higher on Belligerence than the Females. Contrary to the prediction, the Females have scored higher on Belligerence than the Males. d. Contrary to the prediction, the Males have scored higher on Belligerence than the Females. nestion 5 Should a one-tailed or two-tailed test be used? orrect tark 100 0ut Select one: o= a. One-tailed, because there was a directional hypothesis ¥~ Correct Flag and the difference was in the expected direction uestion b. Two-tailed, because there was a directional hypothesis but the difference was not in the expected direction. c. One-tailed, because the two-tailed result was not significant. d. Two-tailed, because the hypothesis was non-directional.

Question 6 Correct Mark 100 out of100 ¥ Flag question Question7 Correct Mark 100 out of100 ¥ Flag question Question 8 Correct Mark 100 out of100 ¥ Flag question Has the assumption of equality (homogeneity) of variances been met? Select one: a. No,because Levene's test is not significant. b. Yes, because Levene's test is significant. C. Yes, because Levene's test s not significant. d. No,because Levene's test i significant. v Ccorrect Which of the following correctly describes the effect size (Cohen's d)? Select one: a. small/weak v Correct b. Large/strong . d Medium/Moderate significant ‘What can you conclude from the 95% confidence interval? Select one: a That we can be 95% confident that the true population mean lies somewhere between the Females scoring 1709 and 0.425 lower than the Males. That there is a large effect size. That the difference between the means of the Males and the Females is not significant. That we can be 95% confident that the Females will score ¥ Correct higher than the Males.

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Question9 Correct Mark 100 out of100 ¥ Flag question Question 10 Correct Mark 100 out of100 ¥ Flag question Which of the following correctly reports the results of the Independent Samples t-test? Select one; a b. 1(106.47)=3.05, p=.002 (one-tailed), d=0.496 ¥ Ccorrect 1(198)=3.28, p=.001, ¢=0.48 1(198)=4.03, p=.023 (one-tailed), d=0.48 1(106.47)=3.05, p=.003 (one-tailed), d=0.48 Which of the following conclusions can you draw from these results? select one: a As predicted, the Males scored significantly higher on Belligerence than did the Females. The Males and Females did not differ significantly on the Belligerence Scale. As predicted, the Females scored significantly higheron ¥ Correct Belligerence than did the Males. Contrary to expectations, the Females scored significantly higher on Belligerence than did the Males.