The null hypothesis (H0): Proportion of U.S. adults with confidence in Congress in 2015 equals 2005 (p = 0.20). Alternative hypothesis (H1): Proportion in 2015 is less than 2005 (p < 0.20).
Null hypothesis (H0): The proportion of U.S. adults with confidence in the U.S. Congress in 2015 is the same as in 2005 (p = 0.20).
Alternative hypothesis (H1): The proportion of U.S. adults with confidence in the U.S. Congress in 2015 is less than in 2005 (p < 0.20).
At a 5% significance level (α = 0.05), if the p-value is less than 0.05, we reject the null hypothesis. This indicates evidence that the proportion of U.S. adults with confidence in the U.S. Congress has decreased since 2005.