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Identify under what study design to use an independent t-test; Use the independent t-test to test hypotheses about mean differences between two populations or treatment conditions; Calculate and evaluate effect size options, Cohen’s d and r 2
- Chapter 3
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- Glossary
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- Linear Regression
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- Measures of Dispersion
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- Probability
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- Chapter 3
It is reasonable to conduct a pooled two-sample t-test since all the assumptions for pooled two-sample t-test are met. Steps: Set up the hypotheses: [latex]H_0: \mu_1 - \mu_2 \leq 0[/latex] versus [latex]H_a: \mu_1 - \mu_2 \: \gt \: 0[/latex]. This is a right-tailed test. The significance level is [latex]\alpha=0.01[/latex].
Jan 8, 2024 · Assuming for the moment that you want to run a two-sided test, the goal is to determine whether two “independent samples” of data are drawn from populations with the same mean (the null hypothesis) or different means (the alternative hypothesis).
Nov 22, 2024 · 10.4.2 Two step procedure for the independent samples t test We will use the \(F\) test to decide whether to use case 1 or 2. SPSS uses a test called “Levine’s test” instead of the \(F\) test we developed to test \(H_{0}: \sigma^2_1 \neq \sigma^2_2\). Levine’s test also produces an \(F\) test statistic.
Nov 18, 2024 · Use an independent samples t-test if your data is interval or ratio. Use a Mann-Whitney U test for ordinal data. For comparing more than two groups: Use ANOVA for interval or ratio data. Use a Kruskal-Wallis test for ordinal data. For comparing frequencies in categories: Use a Chi-square test, which is perfect for nominal data like survey ...
11 Independent-samples t-Test Learning outcomes. In this chapter, you will learn how to: Identify when to use an independent-samples t-test; Conduct an independent-samples t-test hypothesis test; Evaluate effect size for an independent-samples t-test; Identify the assumptions for conducting an independent-samples t-test
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That preliminary test is given to us as Levine’s test in the first two columns of the second table. Levine’s test is similar to but not exactly the same as the test we used but it also uses as a test statistic.
