Cotinine Levels of Smokers The accompanying frequency distribution summarizes the measured cotinine levels of a simple random sample of 40 smokers (from Data Set 5 in Appendix B). a. What is the class...

Cotinine Levels of Smokers
The accompanying frequency distribution summarizes the measured cotinine levels of a simple random sample of 40 smokers (from Data Set 5 in Appendix B).

a.
What is the class width?

b.
What are the upper and lower class boundaries of the first class?

c.
What is the relative frequency corresponding to the frequency of 11 for the first class?

d.
What is the level of measurement of the original cotinine levels: nominal, ordinal, interval, or ratio?

e.
Are the measured cotinine levels qualitative data or quantitative data?