performance between the current sales

I need help answering and demonstrating the findings of this t-test…
The Marketing Department for the HP 200 OfficeJet Printer would like to determine if there is any difference in purchasing performance between the current sales of the HP 200 OfficeJet Printer and sales of the HP 200 OfficeJet Printer with the addition of targeted marketing.  A sample of 31 distributors of HP 200 OfficeJet Printer reveal sales of 75 HP 200 OfficeJet Printer per day with a sample standard deviation of 15 printers per day. The same sample of 31 distributors of the HP 200 OfficeJet Printer with the addition of the targeted marketing reveal an average sale of 90 HP 200 OfficeJet Printer sales per day and a sample standard deviation of 19 printers per day.

 

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