For a given series we can add a trend line which, by applying the selected mathematical function, approximates and shows the trend of data, which was discussed in one of the earlier posts. By displaying the value of R2 we can see how well we chose the function that approximates the data. How else can you improve the trend line appearance?
When entering the parameters of a calculation, it is useful when we can check that the correct values are entered. This type of control serves to check whether a good type of data is entered, whether the values are in the reference range, and can be used to help when entering data into a table. In this way, Excel can also be used as a tool for completing a questionnaire with predefined answers.