hw3 - samples t-test to determine if there is a...

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Homework 3 – Due July 14 th PSYC 60 – Introduction to Statistics Summer Session 1, 2010 1. Use the t-table to report the following values. A. What is the critical t value for a 2-tailed test at the 5% significance level for a sample of N = 10? B. What is the critical t value for a 1-tailed test at 5% significance level for a sample of N=12 C. An experiment is testing for 2-tailed effect at α = 0.01. df = 6. If sample t = 3.2, does that reach significance? What is the exact critical t for determining significance? 2. Tristan and Ian are comparing which sections are doing better. A sample of 10 students from Tristan’s section scored an average of 90% (s = 10) on the latest test. A sample of 10 students from Ian’s section scored an average of 92% (s = 8). Perform an independent
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Unformatted text preview: samples t-test to determine if there is a statistically significant difference between student performance in the two sections. Use the 5-step framework. Make sure to write the hypotheses and conclusion in terms of the problem above. 3. Calculate whether p < .05 for the difference in means for the following samples. Assume a 2-tailed test. You do not need to write out hypotheses or conclusions. (This problem requires calculating t for unequal sample sizes, which will be covered Tuesdays class/reading.) Sample 1: mean = 20, standard deviation = 5, N = 12 Sample 2: mean = 16, standard deviation = 3, N = 24...
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This note was uploaded on 07/26/2010 for the course PSYC PSYC 60 taught by Professor ? during the Spring '09 term at UCSD.

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