For large sample confidence intervals about the mean you have:
xBar ± z * sx / sqrt(n)
where xBar is the sample mean z is the zscore for having α% of the data in the tails, i.e., P( |Z| > z) = α sx is the sample standard deviation n is the sample size
We need only to concern ourselves with the error term of the CI, In order to find the sample size needed for a confidence interval of a given size.
z * sx / sqrt(n) = width.
so the z-score for the confidence interval of .98 is the value of z such that 0.01 is in each tail of the distribution. z = 2.326348
The equation we need to solve is:
z * sx / sqrt(n) = width
n = (z * sx / width) ^ 2.
n = ( 2.326348 * 6 / 3 ) ^ 2
n = 21.64758
Since n must be integer valued we need to take the ceiling of this solution.
n = 22
Answer:
Step-by-step explanation:
- The Fourteenth Amendment made it difficult for African Americans to vote. The Fourteenth Amendment allowed Southern states to pass the Black Codes. The Fourteenth Amendment later became the basis for equal rights claims
<h2>
Brainliest ✅✔️</h2>
I m from India ✔️✅❣️
Answer:
(d-3)/2
Step-by-step explanation:
Difference is subtraction
(d-3)/2
-6 < x (less than or equal to) 8
