**find a 99% confidence interval given &sum _{i=1Calculate a 99% confidence interval to estimate the mean amount of time all employees at this company believe is wasted on unnecessary meetings each week. Solution As before, since we are estimating a mean with a confidence interval, we know it will either be a t-interval or a z-interval.... Therefore, the 99% confidence interval for this sample is 0.55 + 0.63, which is -0.08 to 1.18 If we replicated the same study multiple times with different random samples and computed a confidence interval for each sample, we would expect 99% of the confidence intervals to contain the true slope of the regression line.}**

**find a 99% confidence interval given &sum _{i=1As an example, suppose we have a 99% confidence interval of (0.122, 0.141) for the proportion of likely voters that approve a new measure. Then we could say: Then we could say: “We are 99% confident that the proportion of all likely voters that approve the new measure is …... Calculate a 99% confidence interval to estimate the mean amount of time all employees at this company believe is wasted on unnecessary meetings each week. Solution As before, since we are estimating a mean with a confidence interval, we know it will either be a t-interval or a z-interval.}**

**find a 99% confidence interval given &sum _{i=195 percent and 99 percent confidence intervals are the most common choices in typical market research studies. In our example, let’s say the researchers have elected to use a confidence interval …... As an example, suppose we have a 99% confidence interval of (0.122, 0.141) for the proportion of likely voters that approve a new measure. Then we could say: Then we could say: “We are 99% confident that the proportion of all likely voters that approve the new measure is …}**

**find a 99% confidence interval given &sum _{i=1If you had wanted to compute the 99% confidence interval, you would have set the shaded area to 0.99 and the result would have been 2.58. Figure 2. 95% of the area is between -1.96 and 1.96.... 6/11/2008 · InvNorm(.99+.01) 99% doesn't work out the best, but you can use invNorm for any other percentage. In other words, this is how you would find the confidence interval on a calculator}**

### find a 99% confidence interval given &sum