On March 12, Klein Company sold merchandise in the amount of $7,800 to Babson Company, with credit terms of 2/10, n/30. The cost of the items sold is $4,500. Klein uses the perpetual inventory system and the gross method of accounting for sales. The journal entry or entries that Klein will make on March 12 is:Sales 7,800 Accounts receivable 7,800Sales 7,800 Accounts receivable 7,800Cost of goods sold 4,500 Merchandise Inventory 4,500Accounts receivable 7,800 Sales 7,800Accounts receivable 7,800 Sales 7,800Cost of goods sold 4,500 Merchandise inventory 4,500Accounts receivable 4,500 Sales 4,500

The authors of the paper "fudging the numbers: distributing chocolate influences student evaluations of an undergraduate course"† carried out a study to see if events unrelated to an undergraduate course could affect student evaluations. students enrolled in statistics courses taught by the same instructor participated in the study. all students attended the same lectures and one of six discussion sections that met once a week. at the end of the course, the researchers chose three of the discussion sections to be the "chocolate group." students in these three sections were offered chocolate prior to having them fill out course evaluations. students in the other three sections were not offered chocolate. the researchers concluded that "overall, students offered chocolate gave more positive evaluations than students not offered chocolate." indicate whether the study is an observational study or an experiment. give a brief explanation for your choice.