Adding the variances of the two samples taking the

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adding the variances of the two samples.taking the average of the two variances, accounting for sample size.taking the average of the two variances, disregarding sample size.Question 125 out of 5 pointsIn an independent-samples t test, how is the research hypothesis symbolized?Selected Answer:H1: 1 ≠ 2μμAnswers:H1: 1 ≠ 2μμH0: 1 ≠ 2μμH1: 1 = 2μμH0: 1 = 2μμQuestion 135 out of 5 pointsThe statement “On average, older adults have a different response time than youngeradults” is an example of:Selected Answer:the research hypothesis.Answers:effect size.statistical significance.the null hypothesis.the research hypothesis.Question 145 out of 5 points
To determine the critical values or cutoffs for an independent-samples t test, use:Selected Answer:total degrees of freedom.Answers:degrees of freedom for group 1.degrees of freedom for group 2.N – 1.total degrees of freedom.Question 150 out of 5 pointsWhich formula for calculating the lower bound of a confidence interval is correct?Selected Answer:–t(smean) + (MX – MY)populationAnswers:–t(sdifference) + (MX – MY)samplet(smean) + (MX – MY)populationt(sdifference) + (MX – MY)sample–t(smean) + (MX – MY)populationQuestion 160 out of 5 pointsIn addition to reporting the results of statistical hypothesis testing, it is also recommended that researchers to report:Selected Answer:effect size and median confidence intervals and mean difference scores.Answers:confidence intervals and random selection results.effect size and confidence intervals.effect size and median confidence intervals and mean difference scores.effect size and mean difference scores.Question 175 out of 5 pointss2pooled is the symbol for:Selected Answer:pooled variance.Answers:variance.pooled variance.standard deviation.pooled mean.Question 180 out of 5 pointsUnnithan, Houser, and Fernhall (2006) were interested in whether playing the game Dance Dance Revolution (DDR) affected the heart rate of overweight and non-overweight adolescents differently. A group of 22 adolescents, 10 classified as overweight and 12 as not overweight played DDR for 12 minutes, during which time
the researchers measured each participant's heart rate. Which statistical test should the researchers use to analyze their data?Selected Answer:single-sample t testAnswers:single-sample t testz testindependent-samples t testdependent-samples t testQuestion 195 out of 5 pointsWhich of these illustrates the APA format for reporting statistically significant results for an independent-samples t test?Selected Answer:t(19) = 2.33, p < 0.05Answers:t(N – 1) = 2.33, p < 0.05t(19) = 2.33, p < 0.05t(19) = 2.33, p > 0.05t(N – 2) = 2.33, p < 0.05Question 200 out of 5 pointsMehl (2007) published in the journal Science the results of an extensive study of 396men and women, comparing the number of words uttered per day by each sex. Is thepopulation likely to be normally distributed? Why or why not?

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