zyBooks Respond to these questions in about 200 words.

4.1 Confidence intervals 4.2 Confidence intervals for population means 4.3 Confidence intervals for population proportions 4.4 Hypothesis testing 4.5 Hypothesis test for a population means 4.6 Hypothesis test for a population proportion

A. What is the purpose of a confidence interval (CI)? What information is needed to create the CI?

B. How would you determine if the alternative hypothesis was left-tailed, right-tailed, or two-tailed?

C. The p-value (0.001) is compared to the significance level (0.05), which results in rejecting the null hypothesis and accepting the alternate hypothesis. Does that suggest the result has practical significance? Please explain.

D. The Type I and Type II errors are often confusing. Please explain what each means.

E. Please briefly provide an example where a confidence interval or a hypothesis test could be used with practical significance. Please explain in detail.