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Questions and Answers
What is a characteristic of the t-statistic?
What is a characteristic of the t-statistic?
- It does not require prior knowledge of the population mean or variance. (correct)
- It can only be used when the null hypothesis is true.
- It requires prior knowledge of the population mean and variance.
- It is only used for large sample sizes.
What is the primary reason researchers prefer ANOVA over multiple t-tests?
What is the primary reason researchers prefer ANOVA over multiple t-tests?
- To avoid the assumption of normality
- To reduce the sample size requirement
- To reduce the risk of Type I errors (correct)
- To increase the power of the test
What is the null hypothesis stating in the given example?
What is the null hypothesis stating in the given example?
- The treatment changes the mean.
- The average opinion in the population is not neutral.
- The average opinion in the population is neutral. (correct)
- The population mean is 4.
What is the term for the overall risk of a Type I error from all tests in an experiment?
What is the term for the overall risk of a Type I error from all tests in an experiment?
What is the purpose of using a sample in hypothesis testing?
What is the purpose of using a sample in hypothesis testing?
What happens to the overall risk of a Type I error when conducting multiple hypothesis tests?
What happens to the overall risk of a Type I error when conducting multiple hypothesis tests?
What is the underlying distribution of the population in the example?
What is the underlying distribution of the population in the example?
Why do researchers focus on a single or a few alternative hypotheses?
Why do researchers focus on a single or a few alternative hypotheses?
What is the alpha level in a hypothesis test?
What is the alpha level in a hypothesis test?
What is the sample size in the given example?
What is the sample size in the given example?
Why do researchers need to consider the experimentwise alpha level?
Why do researchers need to consider the experimentwise alpha level?
What is the mean of the cognitive alertness test in the general population?
What is the mean of the cognitive alertness test in the general population?
What is the expected value of the F-ratio when the null hypothesis holds?
What is the expected value of the F-ratio when the null hypothesis holds?
What is the purpose of the three conditions in the research study?
What is the purpose of the three conditions in the research study?
What is the significance of 𝑎𝑎 = .05 in the research study?
What is the significance of 𝑎𝑎 = .05 in the research study?
What is assumed about the distribution of the data in the research study?
What is assumed about the distribution of the data in the research study?
What is the primary goal of hypothesis testing in the research study?
What is the primary goal of hypothesis testing in the research study?
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