{"action":"created","comment":{"url":"https://api.github.com/repos/jmmastey/level_up_exercises/pulls/comments/33527839","id":33527839,"diff_hunk":"@@ -0,0 +1,45 @@\n+require 'json'\n+\n+json = JSON.parse(open('data.json').read).to_a\n+\n+# 1. Total sample size and number of conversions for each cohort.\n+$n = json.count\n+puts \"Sample size: #{$n}\"\n+cohorts = json.partition{ |item|\n+\titem['cohort'] == 'A'\n+}\n+\n+def stats(cohort, name)\n+\tcount = cohort.inject(0){ |sum, data| sum += data['result']}\n+\tputs \"Cohort #{name}: #{count} / #{cohort.count}\"\n+end\n+\n+puts\n+stats(cohorts[0], 'A')\n+stats(cohorts[1], 'B')\n+puts\n+\n+# 2. Conversion rate (including error bars) for each cohort with a 95% confidence.\n+# Square root of (p * (1-p) / n)\n+\n+def confidence(cohort, name)\n+\tcount = cohort.inject(0){ |sum, data| sum += data['result']}\n+\n+\tp = (count.to_f / cohort.count.to_f).round(5)\n+\tse = (2 * Math.sqrt(p * (1 - p) / $n.to_f)).round(5)\n+\tputs \"Conversion Rate = #{p}\"\n+\tputs \"Standard Error = #{se}\"\n+\n+\tlow = (p - se).round(2)\n+\thigh = (p + se).round(2)\n+\tputs \"95% Confidence Interval for Cohort #{name}: \"","path":"data_science/data_science.rb","position":35,"original_position":35,"commit_id":"a5a5ad943e23346035c82f78153a0560b539c648","original_commit_id":"a5a5ad943e23346035c82f78153a0560b539c648","user":{"login":"zsyed1","id":8593056,"avatar_url":"https://avatars.githubusercontent.com/u/8593056?v=3","gravatar_id":"","url":"https://api.github.com/users/zsyed1","html_url":"https://github.com/zsyed1","followers_url":"https://api.github.com/users/zsyed1/followers","following_url":"https://api.github.com/users/zsyed1/following{/other_user}","gists_url":"https://api.github.com/users/zsyed1/gists{/gist_id}","starred_url":"https://api.github.com/users/zsyed1/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zsyed1/subscriptions","organizations_url":"https://api.github.com/users/zsyed1/orgs","repos_url":"https://api.github.com/users/zsyed1/repos","events_url":"https://api.github.com/users/zsyed1/events{/privacy}","received_events_url":"https://api.github.com/users/zsyed1/received_events","type":"User","site_admin":false},"body":"Hi Joe, There are lots of `hound` errors - the first few are about using  a `tab` instead of spaces. We use two spaces per indentation level for ruby code. Please fix these and re-submit. I'll be happy to review it then. The hound errors clutter the review notes.\r\n\r\n@djkotowski Please assign this to me when Joe 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