Answer:72x3=216
72x7=504
504-216=288
Step-by-step explanation:
Answer:
Step-by-step explanation:
Assuming conditions are met, the formula for a confidence interval (CI) for the difference between two population proportions is where and are the sample proportion and sample size of the first sample, and and are the sample proportion and sample size of the second sample.
We see that and . We also know that a 98% confidence level corresponds to a critical value of , so we can plug these values into the formula to get our desired confidence interval:
Hence, we are 98% confident that the true difference in the proportion of people that live in a city who identify as a democrat and the proportion of people that live in a rural area who identify as a democrat is contained within the interval {-0.2941,-0.0337}
The 98% confidence interval also suggests that it may be more likely that identified democrats in a rural area have a greater proportion than identified democrats in a city since the differences in the interval are less than 0.
The answer is g. 47.1
you use the formula
c= π d
then plug is 15 for d and you should get the answer
Answer:
x = 15/7
Step-by-step explanation:
Cross multiply.
2(5+x) = 5(5-x)
Expand the brackets.
10+2x = 25 - 5x
Add 5x and -10 on both sides.
2x + 5x = 25 -10
Combine like terms.
7x = 15
Divide both sides by 7.
x = 15/7