What we are looking for is the confidence interval.
Given:
Sample it is denoted by n = 10
Mean = 80
Standard deviation = 12
Confidence Interval = 99%
Now compute for the margin of error, the formula is Za/2 * σ/√(n)
A 99% level of confidence has a critical value of zα/2 = 2.58.
The standard error is σ/√(n) = 3.162
Multiply 2.58 by 3.162 = 9.8 is the margin of error.
The formula for confidence interval is x̅ ± Za/2 * σ/√(n)
= 80 ± 9.8
= 70.2 < x< 89.8
Answer: It helped build power plants.
Explanation: The Rural Electrification Act granted federal loans for the installation of electrical distribution systems to serve rural areas.
<span>I believe the answer is: Mr. Jones had signed an authorization to disclose the information for the test results and the result should be given to the health department.
By making this authorization, Mr. Jones has given Dr. Marks with the right to handle the information regarding his personal test as long as its within the scope of health department database. This would take out all the legal grounds that Jones could use to sue Dr. Marks.</span>