QMS 202 Chapter Notes - Chapter 12-13: Null Hypothesis, Analysis Of Variance, Total Variation
2 Jan 2018
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Qms 12. 1 comparing the means of two independent populations. The test statistic used to determine the difference between the population means is based on the difference between the sample means (x1-x2) If the populatio(cid:374)s are(cid:374)"t (cid:374)or(cid:373)ally distri(cid:271)uted, the ) test is still appropriate if the sa(cid:373)ple sizes are large enough. Z test for the difference between two means. Pooling of variances is important when sample sizes are significantly different. Qms 12. 4 comparing the proportions of two independent populations. In evaluating differences between two population proportions, you can use a z test for the difference between two proportions. P1 proportion of items of interest in sample 1. X1 number of items of interest in sample 1. 1 proportion of items of interest in population 1 under the null hypothesis you assume that the two population proportions are equal because the pooled estimate for the population proportion is based on the null hypothesis.
