In a study to examine whether oat bran was more effective than cornflakes in reducing the risk of diabetes, investigators enrolled participants and assigned some to the oat bran group and the others to corn flakes, and obtained the incidence proportion ratio of diabetes, comparing oat bran to

cornflakes. Use this information to answer questions

1. If the point estimate and 95% confidence interval for the incidence proportion ratio comparing oat bran to corn flakes were 0.55 (0.35 - 2.35), would this represent a statistically significant association?

a. Yes

b. No

2.If the point estimate and 95% confidence interval for the incidence proportion difference comparing treatment to placebo were 0.96 (0.75 - 1.80), would this represent a statistically significant association between the treatment and nausea?

a. Yes

b. No

3. If the point estimate and 95% confidence interval for the incidence proportion ratio of diabetes comparing bran flakes to cornflakes were 0.56 (0.46 to 0.66), would this represent a statistically significant association?

a. Yes

b. No

All these questions look similar. Can you please explain how they are different and how I should approach to find whether it is significantly statistic or not.

Thanks