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10_Lecture10.2_tTest_FirstReview_0325r_Spring11

10_Lecture10.2_tTest_FirstReview_0325r_Spring11 - PSY207B...

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1 PSY207 B Spring 2011 Psychological Statistics t Test First Review I. Determining the correct t test to apply…. 1 sample 2 samples Independent How are the samples related? How are the samples related? t Test for 1 Sample t Test for 1 Sample t Test for 2 Dependent Samples t Test for 2 Dependent Samples How many samples? How many samples? t Test for 2 Independent Samples t Test for 2 Independent Samples How many times is the sample measured? How many times is the sample measured? z Test z Test Population variance known? Population variance known? known unknown To Decide Which Kind of Tests You Should Use... 1 measure Matched 2 measure Let’s practice ... How are the samples related? How are the samples related? t Test for 1 Sample t Test for 1 Sample t Test for 2 Dependent Samples t Test for 2 Dependent Samples How many samples? How many samples? t Test for 2 Independent Samples t Test for 2 Independent Samples How many times is the sample measured? How many times is the sample measured? z Test z Test Population variance known? Population variance known? A. An educational psychologist studies the effect of frequent testing on retention of class material. In one of the professor's sections, students are given quizzes each week. The second section receives only two tests during the semester. At the end of the semester, both sections receive the same final exam, and the scores are summarized below. Do the data indicate that testing frequency has a significant effect? Use a two-tailed test with α = .01. M = 68 M = 72 s 2 = 7 s 2 = 8 n = 15 n = 15 Two Exams Frequent Quizzes How are the samples related? How are the samples related? t Test for 1 Sample t Test for 1 Sample t Test for 2 Dependent Samples t Test for 2 Dependent Samples How many samples? How many samples? t Test for 2 Independent Samples t Test for 2 Independent Samples How many times is the sample measured? How many times is the sample measured? z Test z Test Population variance known? Population variance known? B. A researcher is testing the effect of a new cold and flu medication on reaction time. A sample of n = 9 students is obtained and each student is given the normal dose of the medicine. Thirty minutes later, each student's reaction time is measured. The scores for the sample averaged M = 211 milliseconds with SS = 1152. Assuming that reaction time for students in the regular population averages μ
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