Construct one table that includes relative frequencies based on the frequency distributions shownbelow, then compare the amounts of tar in nonfiltered and filtered cigarettes. Do the cigarette filters appear to beeffective? (Hint: The filters reduce the amount of tar ingested by thesmoker.)

Tar (mg) in Nonfiltered Cigarettes Frequency Tar (mg) in Filtered Cigarettes Frequency

12-15 1 4-7 3

16-19 0 8-11 2

20-23 14 12-15 6

24-27 7 16-19 14

28-31 3