STAT 218 Chapter Notes - Chapter 10: Confidence Interval, Statistical Hypothesis Testing, Analysis Of Variance
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Who has a higher mean gpa, male students or female students: to answer this question you might construct and confidence interval or you might perform a hypothesis test. Variance: this is typically referred to as anova. 10. 2 comparing multiple population means: ha does not require that all means differ, simply only one mean needs to be quite different from the others to suggest ha is true. Variance within groups: the second measure of spread we look at is the variation within the means, this is a measure of the sampling error (or chance variation) within samples. The test statistic: recall the second step in any hypothesis test is to calculate the test statistic. In previous chapters, you have seen z-values and t-values used as test stat"s: for anova, we now introduce a new test statistic: f-statistic, as always, the smaller the p-value, the more confident we are that ha is true.
