um Module 10 Discussion Board (2 DUE DATES) - 2 types of Confidence Intervals 31 31 We've seen that for means, we will typically use a t-distribution to build our interval, and for proportions, we will use a z-interval to build our intervals. Let's address this: Initial Post: 1. Often times, we are not told to use a mean or a proportion, but we should know which is the best method for measuring our data. octor Explain, what type of data would it be most appropriate to use a mean and what type of data would it be most appropriate to use a proportion? 2. What happens to a confidence interval if we increase the confidence level (for example 95% to 99%)? What happens if we only increase the sample size? ated 3. Write TWO questions: (a) one that can be answered using a z-interval for a proportion, (b) one that can be answered using a t-interval for a mean. Do not say which one is which. Example: (1) About how many minutes does it take to fly from Los Angeles to San Francisco? (2) Estimate the rate at which flights are canceled when flying out of John Wayne Airport. Note that my question (1) can be estimated using a t-interval to estimate the mean length of time in minutes, and my question (2) can be estimated using a z-interval to estimate the proportion of canceled flights at John Wayne Airport. Reply Post