Answer:
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of 
, and a confidence level of 
, we have the following confidence interval of proportions.
In which
is the estimate
z is the zscore that has a pvalue of 
, also called the critical value.
The standard error is:
90% confidence level critical value
So 
, z is the value of Z that has a pvalue of 
, so 
.
Estimate:
72 petty theft cases and finds 45 of these have gone unsolved.
So 
Standard error:
Answer:
Answer:
Step-by-step explanation:
Add 2 to both sides
Simplify
Subtract 
from both sides
Simplify
Multiply both sides by 
(reverse the inequality)
Simplify
Divide both sides by 
Divide the numbers: 
Divide the numbers: 
Apply fraction rule: 
Divide the numbers: 
Try this solution, note, the suggested option is not the shortest way.
2x77}{x} theis way is the best answee
