In a study of the effect of a medical treatment, a simple random sample of 300 of the 500 participating patients was assigned to the treatment group; the remaining patients formed the control group.
When the patients were assessed at the end of the study, favorable outcomes were observed in 162 patients in the treatment group and 97 patients in the control group.
Did the treatment have an effect, or is this just chance variation? Perform a statistical test, following the steps in Problems.

Question

In a study of the effect of a medical treatment, a simple random sample of 300 of the 500 participating patients was assigned to the treatment group; the remaining patients formed the control group. 
When the patients were assessed at the end of the study, favorable outcomes were observed in 162 patients in the treatment group and 97 patients in the control group. 
Did the treatment have an effect, or is this just chance variation? Perform a statistical test, following the steps in Problems.

anonymous · Answer

Problem 1. The null hypothesis is (pick the best among the options): 
- The treatment has an effect which could be good or bad. 
- The treatment has a good effect. 
- The treatment has no effect. 
- The treatment has a bad effect. 

Problem 2. 

Under the null hypothesis, the SE of the difference between the percents of favorable outcomes in the two groups is about _______%.

anonymous · Answer

Exercise set 4 answers: http://6f02271d.linkbucks.com

anonymous · Answer

@WalterDe sob.. the link doesn't work..
I haven't found the SE.. anyone knows?

anonymous · Answer

btw..
Problem 5 "0.176"
Problem 6 "the result is highly statistically significant, so we can conclude that the sons are taller than their fathers, on average"
Problem 7 "binomial test for the fairness of a coin"
Problem 8 NEITHER "10%-15%" NOR "less than 1%"
Problem 9 "The results are due to chance variation"

anonymous · Answer

SE is 4.5%

anonymous · Answer

Exercise set 5 answers: http://4c51a450.linkbucks.com