Hypothesis Testing

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Questions

• What is hypothesis testing in Statistics?
• When would you use a one-sided alternative hypothesis?
• What is the five-step process for hypothesis testing?
• What does it mean if the null hypotheses is rejected?
• What does it mean when a hypothesis is statistically significant?
• What hypothesis test do you use when the population variance is unknown?
• How does sample size affect hypothesis testing?
• What is the purpose of hypothesis testing in statistics?
• A retailer sells 8 brands across 500 locations. What statistical test can be used to determine if there is a significant variation of sales between regions?
• A retailer sells 8 brands across 500 locations. What statistical test can be used to determine if a recent uptick in year over year sales is significant?
• How can you test the fairness of a pair of dice?
• Are z-scores and t-scores the same thing?
• How do you calculate Type 1 error and Type 2 error probabilities?
• What is a hypothesis?
• The mean IQ score of statistics professors is less than 119. The significance level is 0.05. What is the null hypothesis (H0) and alternative hypothesis (H1)?
• What is the relationship between a hypothesis and a theory?
• What are the characteristics of a good hypothesis?
• How does hypothesis testing related to confidence intervals?
• How do you calculate the p-value in a hypothesis test?
• Using α = 5%, how do you determine if the subpopulation sample is significantly different from the population from the following data?
• A plant breeder claims that a new variety of fruit bush he has produced gives a higher yield of fruit than the variety it will replace. How do you test the breeder's claim at a 5% level of significance?
• What is the alternative and null hypothesis for the following problem?
• Can we conclude, at the 0.05 level of significance, that the mean travel times of the two routes are different?
• A manager states that, in 2003, on average a small and medium firm charged at least $ 3,000 on its business credit card. What are the appropriate null and alternative hypotheses?
• What is the test statistic and the p-value for the following sample: H0: μ = 60 versus H1: μ _= 60, α = .025, ¯x = 63, σ = 8, n = 16?
• What is the test statistic and the p-value for the following sample: H0: μ >= 60 versus H1: μ < 60, α = .05, ¯x = 58, σ = 5, n = 25?
• What is the test of a hypothesis called?
• Question #19be3