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Quiz 8 Hypothesis testing Comparing two samples

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1. Given two samples of size 35 with normally distributed data and unknown population SDs which statistical distribution should be used to test sample mean differences? a) binomial b) Students t c) standard normal d) chi-squared

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2. Which is the correct statistical decision when the test value (TV) falls inside the critical region? a) accept null b) reject null c) not reject H 0 d) not reject H 1 TV

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3. What are the critical values for a two-tailed independent-groups t-test assuming equal variances, =0.05 and the two groups have 10 scores each? a) +/–2.262 b) +/–2.228 c) +/–2.101 d) +/–2.093

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4. What are the critical values for a two-tailed dependent-groups t-test using =0.05 and a group consisting of 20 subjects? a) +/–2.262 b) +/–2.228 c) +/–2.101 d) +/–2.093

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5. Which is the correct statistical decision for a dependent-groups t-test with 10 subjects that yielded a value of 1.96 given =0.05? Use a 2-tailed test. a) reject H 0 ( D =0) b) not reject H 0 c) reject H 1 ( D 0) d) not reject H 1

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6. You want to test 2 groups of 35 subjects each. If the data are normally distributed and variances are equal but is unknown which test should you use? a) z-test b) dependent-groups t-test c) independent-groups t-test d) Wilcoxon rank-sum test

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7. What is the P-value for a z-test value of 1.40? Assume a two-tailed test is used. a) 0.1616 b) 0.0808 c) 0.0404 d) 0.0500

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8. Two sample means from two independent groups were tested with SPSS. The results are shown below. What is the correct statistical decision? a) reject H 0 ( 1 = 2 ) b) not reject H 0 c) reject H 1 ( 1 2 ) d) not reject H 1

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