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A researcher wishes to test the hypothesis that low education affects crime. She gathers a sample of people aged 25 and older. What is the unit of analysis?

To maintain quality control in a brewery, every 20th bottle of beer coming off the production line was opened and tested, after the first bottle was randomly selected at the beginning of the day. This led to too much beer consumption on the job. The manager decided to use a new sampling plan. The new method used a computer to randomly select 1% of the bottles produced in a given day where each bottle had the same probability of being selected. What is the name of the initial sampling method?

Which of the following would best depict nominal level data? 

Boxplots are graphs that display the

The standard score, Z, is only useful in comparing scores from the same distribution.  

Income distributions almost always have a positive (right) skew (since there are only a few very wealthy people). Therefore, the preferred measure of central tendency for this variable would be the

Which of the following data sets shows the greatest variability?

The possible values for a standardized score (z score) can be any number: positive, negative, or 0  

What is the level of measurement  for the following variable? The age at which an offender was arrested for the first time __________ (measured as 12, 15, 25, 34, etc)

What is the cumulative percentage for someone aged 19 and younger from the following frequency distribution? Table 1: Ages of Respondents Ages Frequency Percent Cumulative Percent 18 5 10 10 19 21 42   20 11 22   21 13 26   Total 50 100 100