BIOL499A Chapter Notes - Chapter 24: Confidence Interval, Hemoglobin, Standard Deviation
13 Feb 2014
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Chapter 24: comparing two population means two. The difference between independent and dependent samples, For comparing two treatments, the two basic types of design are: 1 and 2 are unknown and unequal: use t-test without pooling or conservative t-test. 2 is unknown for two independent samples: we consider. Case 1 (unknown population standard deviations are equal): suppose that the two normal population distributions have same standard deviation. The best way to combine these two estimates is: 2 because it combines the information in both. This is called the pooled estimator of samples. , the test statistic is: distribution, with df n. Example 24. 1: a study was conducted to find out whether the children of aggressive families have a higher behavior problem checklist (bpc) score. The sample mean and standard deviation of bpc scores for 13 children whose parents were classified as aggressive were 7. 92 and 3. 45 respectively.
