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Chapter 9: t statistic - Coggle Diagram
Chapter 9: t statistic
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t statistics is used to test hypotheses about an unknown pop mean, fancy u, when the value of s is unknown. The formula for the t statistic has the same structure as the z-score formula, except that the t statistic uses the estimated standard error in the denominator
t distribution is the complete set of t values computed for every possible random sample for a specific sample size or df
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assumptions: values in the sample must consist of independent observations and the pop sampled must be normal
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if your sample t statistic is greater than the value listen you can be certain that the data are in the critical region, and reject the null
4 steps in hypothesis testing: 1) state the hypotheses and select an alpha level. 2) locate the critical region. 3) calculate the test statistic. 4) make a decision regarding the null
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