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Industrial Statistics with Minitab by Xavier Tort-Martorell Llabres, Lluis Marco Almagro, Pere Grima Cintas

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2. I cannot make any operation with the data contained in a column. What is happening?

Most probably the column data is in text format. A column is automatically assigned a text format when any cell contains text or a symbol different from * (missing value symbol).

When a column is in text format, it does not automatically change to a numeric format even though the text or symbols contained in the column are eliminated.

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