 Hello, this is a video on making a two sample confidence interval for two means. Create a 90% confidence interval for mu1 minus mu2 given the following sample data. So they give you the sample size, sample mean, and sample standard deviation for each group. No need to write it out again. This is all the information we need for Google Sheets. We also need the confidence level, which is 90% or 0.90. So let's go to Google Sheets. Let's go to the data list tab. And type in the mean, standard deviation, sample size for both groups. So the mean is 2.98, standard deviation 0.76. Sample size is 20. For the second group, the mean is 3.39. The sample standard deviation is 0.92. And the sample size would be 50. The confidence level, in this case, since I'm building a confidence interval that's nailing other piece of information I need, it's 0.90. And look, we have a lower bound of negative 0.77. And we have an upper bound of negative 0.05. So let's write that down. I know that mu1 minus mu2, the difference of the population means, is going to be between negative 0.77 and negative 0.05.