Use the data dictionary for the Master Data File in Course materials. Identify the appropriate level of measurement for variable TIMENA, Total time worked as a NA, that is coded as follows: 1. 6 months or less 2. More than 6 months to less than 1year 3. 1 year to less than 2 years 4. 2 to 5 years 5. 6 to 10 years 6. 11 to 20 years 7. More than 20 years 88. DK-do not know 99. Not ascertained Blank. Not applicable What are the attributes for this variable? years Numbers 1-7, 88 and 99 that refer to a range of years Numbers 1-7, 88 and 99 that assign each respondent to a group based on his or her response None of the above