# Answers confidence interval research hypothesis null

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Answers:confidence interval.research hypothesis.null hypothesis.standard error.Question 155 out of 5 pointsThe correct formula for the lower bound of a confidence interval for a single-sample t test is:Selected Answer:–t(sM) + Msample.Answers:t(sM) + Msample.–t(sM) – Msample.t(sM) – Msample.–t(sM) + Msample.Question 165 out of 5 pointsWhen performing a single-sample t test, an effect size of 0.80 would be interpreted as a _____ effect.Selected Answer:largeAnswers:smallmediumlargenegligibleQuestion 170 out of 5 pointsWhat would be the decision for a two-tailed paired-samples t test where the t statistic is 2.67, with cutoffs of ±2.776?Selected Answer:fail to reject the research hypothesisAnswers:reject the null hypothesisfail to reject the null hypothesisreject the research hypothesisfail to reject the research hypothesis
Question 185 out of 5 pointsThe symbol s is a _____ letter that describes a _____ statistic.Selected Answer:Latin; sampleAnswers:Latin; sampleGreek; sampleLatin; populationGreek; populationQuestion 190 out of 5 pointsWhat is the correct formula for calculating the standard deviation of a sample when one is NOT trying to estimate the population standard deviation?Selected Answer:Answers:Question 205 out of 5 pointsWhy does one divide by N – 1 rather than by N when estimating a population standard deviation from the sample standard deviation?Selected Answer:Because the sample standard deviation is likely to be an imprecise estimate, we allow the error of the estimate (the standard deviation) to be larger by dividing the sum of squares by a smaller number.Answers:Because the sample standard deviation is likely to be an imprecise estimate, we allow the error of the estimate (the standard deviation) to be larger by dividing the sum of squares by a smaller number.The sample standard deviation is a superior estimate of the variability in the population than is the population standard deviation.We typically have to throw out at least one data point in any given study, so the N – 1 allows us to account for that.Because the population is always smaller than the sample, we must divide by a smaller number.Question 1
5 out of 5 pointsAssume the following for a paired-samples t test: N = 9, Mdifference = 13.19, s = 22.3. What is the t statistic?Selected Answer:1.77Answers:0.591.774.401.67Question 25 out of 5 pointsIf the standard deviation for a population, as estimated from a sample, is s = 10.23, then the standard error for a sample size of N = 20 is sM =Selected Answer:2.29.Answers:0.51.2.29.2.35.4.47.Question 35 out of 5 pointsWhich of the following is NOT used as groups in t distribution:Selected Answer:two samples and two populations.Answers:a sample and a population.two samples as part of a within groups design.