11_Lecture11.2_tTest_Review2_0330r_Spring11

11_Lecture11.2_tTest_Review2_0330r_Spring11 - t Test Review...

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1 PSY207 B Spring 2011 Psychological Statistics t Test Review II Determining the correct procedure to apply in a given scenerio 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 1 sample mean 2 sample means Let’s practice with the questions... (1). A nutrition store in the mall is selling “Memory Booster” which is a concoction of herbs and minerals that has a effect on memory performance. To test the effectiveness of the herbal mix, a researcher obtains a sample of n = 16 people and has each person take the suggested dosage each day for 4 weeks. At the end of the four-week period, each individual takes a standardized memory test. The scores from the sample produced a mean of M = 26 with a sample variance of s 2 = 64. In the general population, the standardized test is known to have a mean of μ = 20. 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? 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? (2). A biopsychologist studies the role of the brain chemical serotonin in aggression. One sample of rats serves as a control group and receives a placebo. A second sample of rats receive a drug that lowers brain levels of serotonin. Then the researcher tests the animals by recording the number of aggressive responses each of the rats display.
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2 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?
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