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The purpose of this research is : (1) to describes the error of Indonesian language in exposition text by the students at class X, (2) causes of error, and (3) the effort which is done by the teacher and student to solve the error. This research is a qualitative descriptive research with a sample student text SMAIT Ummul Quro Bogor kelas X IPA 1  dan X IPA 3. The sampling technique used was purposive sampling. Data collection techniques used were in-depth interviews and document analysis. Data analysis technique used is the interactive analytical model that includes four components, namely data collection, data reduction, data presentation, and verification. The conclusions of this study are as follows. Firstly, the linguistic elements of language errors that often occur in the student text is divided into four errors : spelling error, diction, sentence, and paragraph. Secondly, language errors that often occur in a student text exposition caused by several factors, among others: is inadequate of language mastery, lack of examples by the teachers, the influence of foreign language, lack of writing peactice, and lack of writing time. Thirdly, the efforts have been made to minimize errors include: improving students' language mastery, having more practices in writing, implementing appropriate correction technique, and implementing a process approach to teaching writing.

In developing a business or sale is to follow technological developments including the use of systems for buying and selling interactions. There are already many sellers who make buying and selling interactions online. In addition, to develop a business, it is also necessary to predict future sales so that the seller knows and prepares the number of goods to be sold to avoid shortages or excess quantities of goods. To find sales predictions, various methods can be used, one of which is Double Exponential Smoothing method. Double Exponential Smoothing  method is the time series method that uses data from the past to predict the next period. The data processed is sales data at Dasni clothing stores for one year. The results obtained are in the form of a sales prediction system for the next 3 months period which calculates the level of prediction accuracy using MAPE (Mean Absolute Percentage Error) with the smallest error sought because the smaller the error, the more accurate it is to predict the number of sales in the next period. This prediction system is also designed using the PHP programming language.

The purpose of this study is (1) to describe the errors in terms of syntax, which are found in online media Kompas.com; (2) to provide correction of language errors in terms of syntax, which are contained in Kompas.com online media. This research is a descriptive qualitative research. The data collection technique used is the listening technique to obtain data by listening to the use of language and note-taking techniques to record words or sentences for analysis. The results of the analysis regarding the analysis of language errors can be concluded that there are forms of language errors in the field of syntax. One of them is the researcher determines the structure of sentences in news texts based on functions, categories, and roles.

Indonesian as the language of unity and national identity must be upheld, namely by learning and using good and correct Indonesian. However, we often encounter language errors in newspapers, especially news on social media. The purpose of this study is (1) to describe language errors in terms of spelling, morphology and semantics contained in detik.com news; (2) to provide corrections for language errors in terms of spelling, morphology and semantics contained in detik.com news. This research is a descriptive qualitative research. The data collection technique used in this study is the observation and note taking technique. The use of the listening technique is carried out by listening to the data on the use language and the note taking technique is carried out with what forms of language errors are made and analyzing according to the form of the error. The results of the analysis of the analysis of language errors in detik.com news October 2022 edition can be concluded that there is a form of error in the news title 10 Sacks of CD Allegedly Pilgrims Scattered in Nagara Padang Ciwidey Here there is ambiguity in the choice of words for the news title, error standard word, spelling errors, punctuation errors, affix errors and capitalization errors.