Exercise

The mean of means

You want to know what the average number of users (num_users) is per deal, but you want to know this number for the entire company so that you can see if Amir's deals have more or fewer users than the company's average deal. The problem is that over the past year, the company has worked on more than ten thousand deals, so it's not realistic to compile all the data. Instead, you'll estimate the mean by taking several random samples of deals, since this is much easier than collecting data from everyone in the company.

The user data for all the company's deals is available in all_deals.

Instructions

100 XP
  • Set the random seed to 321.
  • Take 30 samples of size 20 from all_deals$num_users and take the mean of each sample. Store the sample means in sample_means.
  • Take the mean of sample_means.
  • Take the mean of the num_users column of amir_deals.