What is the significance and the confidence intervals

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Reference no: EM133624207

1) Why might the t-test be more useful in actual practice rather than a z-test?

After watching this video answer the following:

What is the significance and the confidence intervals telling you about the two classes with regard to their scores on the quiz?

If one of these classes was a class you taught and your principle asked you to interpret this data what might you say?

3) Explain a detailed answer as to why we might run an ANOVA over a t-test and what factors are in consideration in choosing an ANOVA instead of a t-test.

4) Why do we run a post-hoc test when after having calculated an ANOVA that found statistically significant results?

What is the significance of a post-hoc test containing zero within the confidence intervals?

5) After reading the below scenario, write out which statistical test you would use.

"Researchers have noticed that there appears to be a regular, year-by-year increase in the average IQ for the general population. To evaluate the size of the effect, a researcher obtained a 10-year old IQ test that was standardized to produce a mean IQ of μ = 100 for the population 10-years ago. The test was then given to a sample of n = 64 of today's adults. The average score for the sample was M = 107 with s = 12. Based on the sample, is the average IQ for today's population significantly different from the average 10 years ago when the test would have produced a mean of μ = 100?"

Reference no: EM133624207

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