1.(10 pts.) Jackson et al. (2013) wanted to know whether it is better to give the diphtheria, tetanus and pertussis (DTaP) vaccine in either the thigh or the arm, so they collected data on severe reactions to this vaccine in children aged 3 to 6 years old. One nominal variable is severe reaction vs. no severe reaction; the other nominal variable is thigh vs. arm.

Injection Site No Severe Reaction Severe Reaction

Thigh 4758 30

Arm 8840 76

a.(1 pt.) State the null and alternative hypotheses

b.(4 pts.) Compute the appropriatex²test and paste the SPSS output here.

c.(5 pts.) Write the Results section for your findings.Include the descriptive statistics, type of statistical test and results of the correct test effect size if appropriate.