Vaccine Autistic Normal Total
Yes 21 15 86
No 29 35 64
Total 50 50 100
a. What type of study design was used in this research?
b. Calculate and interpret the relative risk and odds ratio of autism for vaccine recipients v. non-recipients.
c. Which of the two comparative measures is more meaningful in this instance and why?
5. Search online to find the population of all cities and towns in Massachusetts. Make a simple frequency distribution of the first (left-hand) digit of the populations. Include percentages, cumulative frequencies, and cumulative percentages. What pattern do you see in the frequency distribution? Does it look like all digits are equally likely? If not, think about why that might be?
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