Which of the following correctly describes a confidence interval? )An estimate of the range of values within which a population parameter falls at a given level probability O An estimate of how confident we can be in a sample statistic estion 2 We reject a true null hypothesis. we make a O Type | error O Type II error estion 3 Which of the following is ture? O If we have good sample statistics we can determine the values of population parameters with exactness and certainty O When estimates of population parameters are based on sample statistics we cannot be sure they are correct stion 4 Why is 0.05 commonly chosen as the cut-off value for statistical significance? It provides a reasonable compromise between the probabilities of making type I and type II errors. It provides a trade-ff between the probabilities that the null hypotheses and the alternative hypothesis are correct. estion 5 Statistical Significance tells us whether a difference between two means is important from a practical point of view. O True O False iestion 6 Is the null hypothesis a statement about O the nature of the popluation O the nature of the sample estion 7 Which of these do inferential statistical methods make it possible to test directly? The alternative hypothesis The null hypothesis estion 8