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Exercise

Standard error

Previously we observed how to calculate the standard deviation using the .std() method. In this exercise, you will explore how to calculate standard deviation for a conversion rate, which requires a slightly different procedure. You will calculate this step by step in this exercise.

Loaded for you is our inner merged dataset purchase_data as well as the computed conversion_rate value.

Instructions

100 XP
  • Find the number of paywall views in the dataset using .count(). Store this in n.
  • Calculate a quantity we will call v by finding the conversion_rate times the rate of not converting.
  • Now find our variance, var, by dividing v by n. This is the variance of our conversion rate estimate.
  • Finally the square root of var has been taken and stored as the variable se for you. This is the standard error of our estimate.