Answer:
1 and 3
Step-by-step explanation:
Part a: 1 and 3
part b: x = −22
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Answer: ![z=9](https://tex.z-dn.net/?f=z%3D9)
Step-by-step explanation:
If you meant to solve for "z", then refer to the attachment below.
Answer:
416025
Step-by-step explanation:
For confidence interval of 99%, the range is (0.005, 0.995). Using a z-table, the z-score for 0.995 is 2.58.
Margin of error = 0.2% = 0.002.
Proportion is unknown. So, worse case proportion is 50%. p = 50% = 0.5.
\\ ![n = \left(\frac{\texttt{z-score}}{\texttt{margin of error}} \right )^2\cdot p\cdot (1-p) \\ = \left(\frac{2.58}{0.002} \right )^2\cdot 0.5\cdot (1-0.5)=416025](https://tex.z-dn.net/?f=n%20%3D%20%5Cleft%28%5Cfrac%7B%5Ctexttt%7Bz-score%7D%7D%7B%5Ctexttt%7Bmargin%20of%20error%7D%7D%20%5Cright%20%29%5E2%5Ccdot%20p%5Ccdot%20%281-p%29%20%5C%5C%20%3D%20%5Cleft%28%5Cfrac%7B2.58%7D%7B0.002%7D%20%5Cright%20%29%5E2%5Ccdot%200.5%5Ccdot%20%281-0.5%29%3D416025)
So, sample size required is 416025.
Changing the subject of the formula
Check the picture below.
if you check your Unit Circle, it'd be there.