Question: The ideal study should be designed and controlled for precise and unambiguous measurement of the variables. Since complete control is unattainable, error does occur. Much

The ideal study should be designed and controlled for precise and unambiguous measurement of the variables. Since complete control is unattainable, error does occur. Much error is systematic (results from bias), while the remainder is random (occurs erratically). Four major error sources may contaminate results of a study. a. Name the four (4) sources of measurement errors in a study (4 marks) b. Explain each of the sources of measurement errors. (8 marks) c. Explain the following levels of measurement: i. Nominal ii. Ordinal iii. Interval iv. Ratio (8 marks)

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