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8: Hypothesis Testing with One Sample

Last updated

Sep 12, 2021
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- 7.4: Confidence Interval for Standard Deviation
- 8.1.1: Introduction to Hypothesis Testing Part 1

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8.1.1: Introduction to Hypothesis Testing Part 1
The actual test begins by considering two hypotheses. They are called the null hypothesis and the alternative hypothesis. These hypotheses contain opposing viewpoints. Since the null and alternative hypotheses are contradictory, you must examine evidence to decide if you have enough evidence to reject the null hypothesis or not.
8.1.2: Introduction to Hypothesis Testing Part 2
In every hypothesis test, the outcomes are dependent on a correct interpretation of the data. Incorrect calculations or misunderstood summary statistics can yield errors that affect the results. A Type I error occurs when a true null hypothesis is rejected. A Type II error occurs when a false null hypothesis is not rejected.
8.2: Hypothesis Testing of Single Proportion
Both the critical value approach and the p-value approach can be applied to test hypotheses about a population proportion.
8.3: Hypothesis Testing of Single Mean
Previous hypotheses testing for population means was described in the case of large samples. The statistical validity of the tests was insured by the Central Limit Theorem, with essentially no assumptions on the distribution of the population. When sample sizes are small, as is often the case in practice, the Central Limit Theorem does not apply. One must then impose stricter assumptions on the population to give statistical validity to the test procedure.
8.4: Hypothesis Test on a Single Standard Deviation
A test of a single standard deviation assumes that the underlying distribution is normal. The null and alternative hypotheses are stated in terms of the population standard deviation. A test of a single variance may be right-tailed, left-tailed, or two-tailed
8.5: Hypothesis Test on a Single Variance
A test of a single variance assumes that the underlying distribution is normal. The null and alternative hypotheses are stated in terms of the population variance (or population standard deviation). A test of a single variance may be right-tailed, left-tailed, or two-tailed

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