On Tuesday September 1, investors will have a big batch of economic data to digest along with a few more quarterly earnings reports. Before the market open, discount retailer Dollar Tree (DLTR) will report its latest quarterly numbers, followed by video and image processing products maker Ambarella (AMBA) and tax preparation company H&R Block (HRB). Among these companies, the one to spotlight is Dollar Tree following its recently completed merger with Family Dollar Stores (FDO). For the second quarter of fiscal 2015, analysts are expecting the company to post profits of $0.62 a share on revenue of $3.04 billion. In addition to these notable earnings, there are several different economic reports set to be released on Tuesday. Automakers will report August auto sales. They're expected to report a slight drop to annual rate of 17.3 million units from 17.4 million units in July. Despite the slight fall, numbers overall are expected to be strong. At 9:45 a.m. Eastern, we get the PMI Manufacturing Index, followed by the ISM Manufacturing index at 10 a.m. These reports are both indicators of the economic health of the manufacturing sector. TheStreet's U-Jin Lee reports from New York.