Therefore, a z-interval can be used to calculate the confidence interval. In this example, we are told that the population standard deviation is thought to be 14 minutes and we have a large enough sample size. ![]() If it is believed that the population standard deviation is 14 minutes, then calculate a 95% confidence interval to estimate the average time spent by college students browsing the internet each day. In a sample of 32 college students, the average time spent browsing the internet each day was about 67 minutes. Note: You can scroll down to see a video of these steps! z-IntervalsĪ psychologist wants to estimate the amount of time college students spend browsing the internet each day. In this article, we will see how to use the TI83/84 calculator to calculate z and t intervals. ![]() In both cases, you can either use the formula to compute the interval by hand or use a graphing calculator (or other software).
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