Question

Express the confidence interval 0.319 < p < 0.488 in the form of p ± E.

Answer 1

Answer:

$0.4035+/-0.0845$

Step-by-step explanation:

The fundamental step would be to determine the values of p and E which i believe is the margin of error in this case. Consider the following two equations;

$p-E=0.319\\p+E=0.488$

We simply add the two equations and solve for p;

$2p=0.807\\p=0.4035$

We then substitute this value of p in either equation and solve for E;

$0.4035-E=0.319\\E=0.0845$

Since we have both p and E, the confidence interval can thus be written as;

$0.4035+/-0.0845$