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BE428 Lecture 8: Selecting and Applying Statistical Tests
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- 1when is correlation used?to test whether two sets of measurements taken on a single population are linearly associated
- 2when is regression used?to quantify the linear relationship between two sets of measurements taken on a single population
- 3when is I-proportion test used?to make inferences about a population proportion
- 4when is a z-test used?to compare a sample with a larger population where the mean and SD are known
- 5when is a one sample t test used?to test whether the sample mean of one measurement taken on a single population is different from an expected value
(SD is not known) - 6when is a paired t-test used?to test whether the means of two measurements made on a single identifiable population (dependent samples) are different from each other
- 7when is a two sample t test used?to test whether the means of a single measurement made on two populations (independent samples) are different from each other
- 8when is a one way ANOVA used?to test whether there are statistically significant differences between the means of three or more independent (unrelated) groups
- 9when is a two way ANOVA used?to test whether there are significant differences between the means of three or more groups, taking account of two or more factors at once
- 10what is the relationship between p values and signficiance?typically P = 0.05
if P > 0.05: no significant difference; cannot reject null hypothesis
if P < 0.05: significant difference; reject null hypothesis - 11what is the relationship between p values and significance in ANOVAs?if P > 0.05, there is no significant difference; end of analysis
if P < 0.05, there is a significant difference in samples; look at post-hoc test analysis to check which samples are different - 12what are the three post-hoc tests?1. Dunnetts: allows you to compare all groups to one group
2. Fishers: allows you to compare all groups to each other (individual error rate)
3. Tukey: allows you to compare all groups to each other (family error rate) - 13what are the 5 main steps of statistical tests?1. formulate a null hypothesis
2. calculate the test statistic
3. calculate the significance probability
4. decide whether to reject the null hypothesis
5. interpret your results in context of the problem
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- 4 BE428 Fichas sobre BE428 Lecture 8: Selecting and Applying Statistical Tests, creado por Caitlin M el 10/10/2018.
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- Caitlin M
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