Answer:
Confidence interval: (1760,1956)
Step-by-step explanation:
We are given the following information in the question:
Sample size, n = 81
Sample mean =

Population standard deviation =

Confidence Level = 95%
Significance level = 5% = 0.05
Confidence interval:

Putting the values, we get,


Answer:
50%
Step-by-step explanation:
Explanation:
If you plug 4 in for x into the equation, the equation becomes this:

When you simplify the equation;

Simplify it further,

That is correct. 6 = 6
Hope that answered the question.
4,497,000,000 = <span>4.497 x 10^9</span>
If you solve this problem using the substitution method then,
X = - 8
Y = - 4