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A clear chart can still show bad data - Online practice 1

Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.

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Fictional length records: ID A = 80 cm; ID B = 1.2 m; ID C = blank; a second ID A = 80 cm is a confirmed accidental duplicate of the first record. Keep raw data unchanged. In a cleaned copy convert to centimetres, remove only the confirmed duplicate, and mark C missing rather than zero.

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