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MathReview1

# MathReview1 - Practice Problems with Dependent Sample...

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Practice Problems with Dependent Sample t-test For each of the following problems carry out the following steps: 1. State the null hypothesis 2. State the alternative hypothesis 3. State what statistical test should be done and why. 4. Carry out the appropriate test (if possible). 5. State any possible conclusions. The answers are linked to each problem, but you will not benefit from working the problems ifs you examine the answer before working the problem. Problem 1: An experiment was performed on the effects of study skill training. A randomly selected group of freshmen was used. The group was selected near the end of a fall semester and their fall GPAs obtained. They took the training after exam week in the fall. Their grades were obtained again at the end of spring semester. The results are: Pre-training 2.5 1.2 3.1 2.6 2.8 3.5 2.0 1.1 3.8 4.0 Post-training 2.8 2.4 3.5 3.1 2.7 3.6 2.4 2.1 3.9 3.9 Answer 1 Problem 2: A researcher performed an experiment to determine if the presence of pictures facilitated or interfered with young children's learning of words. Two groups of 5 year olds were selected so that they were matched on pre-school readiness. One group received vocabulary training with the pictures the other without the

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MathReview1 - Practice Problems with Dependent Sample...

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