Answer:
c is the correct answer..........
Answer:
Step-by-step explanation:
47.86
-25.20
+52.75
-22.04
-8.50
+94.11
=39.46
Answer: 0.355,0.405)
Step-by-step explanation:
Given : Significance level : 
Number of subjects (n) = 2455
Number of surveys returned = 931
The probability of surveys get return will be :-

The confidence interval for proportion is given by :-


Hence, the 99% confidence interval for the proportion of returned surveys : (0.355,0.405)