Answer:
Sorry ineed point ehhh thnks po sa points:)
Every confidence interval has associated z value. As confidence interval increases so do the z value associated with it.
The confidence interval can be calculated using following formula:
Where
is the mean value, z is the associated z value, s is the standard deviation and n is the number of samples.
We know that standard deviation is simply a square root of variance:
The confidence interval of 95% has associated z value of <span>1.960.
</span>Now we can calculate the confidence interval for our income:
Answer:
The answer you have selected should be correct.
The answer: <span>13.634
Don't believe me? Check with a(n) calculator!</span>