Question: Do I use the population standard deviation equation or sample standard deviation equation? This is car dealing company's marketing chart. If I have to set

Do I use the population standard deviation equation or sample standard deviation equation?

This is car dealing company's marketing chart. If I have to set sales&deal calls as population

Sales Period Sales Calls Deals Closed January 2019 February 2019 March 2019

Sales Period Sales Calls Deals Closed January 2019 February 2019 March 2019 April 2019 May 2019 April 2019 June 2019 20 53 28 34 40 67 17 26 45 73 12 50 30 60

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