The question is:
Broken arms can be treated with surgery or splints. In a study with 200 patients, half had surgery and half used splints. In the surgery group, 80 patients showed improvement after 2 months whilst 50 who used splints improved. Is surgery more effective than splints for improvement?
a) Write appropriate hypotheses.
b) Test the hypothesis, find the P-value and state your conclusion. Use α = 0.025.
c) Create a 95% confidence interval for the difference in improvement rates, and interpret your interval.
a) Ho: Psurgery - Psplints = 0
Ha: Psurgery - Psplints > 0
Is a right? and for b, I don't know which formula to apply because I initially used the pooled formula, but because the data is halved, n1 and n2 are both equal and I'm not sure if that is right...
Broken arms can be treated with surgery or splints. In a study with 200 patients, half had surgery and half used splints. In the surgery group, 80 patients showed improvement after 2 months whilst 50 who used splints improved. Is surgery more effective than splints for improvement?
a) Write appropriate hypotheses.
b) Test the hypothesis, find the P-value and state your conclusion. Use α = 0.025.
c) Create a 95% confidence interval for the difference in improvement rates, and interpret your interval.
a) Ho: Psurgery - Psplints = 0
Ha: Psurgery - Psplints > 0
Is a right? and for b, I don't know which formula to apply because I initially used the pooled formula, but because the data is halved, n1 and n2 are both equal and I'm not sure if that is right...