Answer:
Step-by-step explanation:
<u>Consider the parent function:</u>
The graph of the function open up and the vertex is at the origin, the point (0, 0)
Now, if it opens down, it means it is a reflection of the parent function over x axis, hence it has a negative coefficient, the function becomes:
The vertex is shifted to the point (-3, 0). It means the function also translated left by 3 units, the function becomes:
<u>Since all the options have 1/20 as a coefficient, our function is:</u>
This is option B
Answer:
Area of the circle= π(27.8²)
Step-by-step explanation:
64
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Answer:
(22.12, 27.48)
Step-by-step explanation:
Given : Significance level : ![\alpha: 1-0.95=0.05](https://tex.z-dn.net/?f=%5Calpha%3A%201-0.95%3D0.05)
Sample size : n= 8 , which is a small sample (n<30), so we use t-test.
Critical values using t-distribution: ![t_{n-1,\alpha/2}=t_{7,0.025}=2.365](https://tex.z-dn.net/?f=t_%7Bn-1%2C%5Calpha%2F2%7D%3Dt_%7B7%2C0.025%7D%3D2.365)
Sample mean : ![\overline{x}=24.8\text{ hours}](https://tex.z-dn.net/?f=%5Coverline%7Bx%7D%3D24.8%5Ctext%7B%20hours%7D)
Standard deviation : ![\sigma=3.2\text{ hours}](https://tex.z-dn.net/?f=%5Csigma%3D3.2%5Ctext%7B%20hours%7D)
The confidence interval for population means is given by :-
![\overline{x}\pm t_{n-1,\alpha/2}\dfrac{\sigma}{\sqrt{n}}](https://tex.z-dn.net/?f=%5Coverline%7Bx%7D%5Cpm%20t_%7Bn-1%2C%5Calpha%2F2%7D%5Cdfrac%7B%5Csigma%7D%7B%5Csqrt%7Bn%7D%7D)
i.e. ![24.8\pm(2.365)\dfrac{3.2}{\sqrt{8}}](https://tex.z-dn.net/?f=24.8%5Cpm%282.365%29%5Cdfrac%7B3.2%7D%7B%5Csqrt%7B8%7D%7D)
![24.8\pm2.67569206001\\\\\approx24.8\pm2.68\\\\=(24.8-2.68, 24.8+2.68)=(22.12, 27.48)](https://tex.z-dn.net/?f=24.8%5Cpm2.67569206001%5C%5C%5C%5C%5Capprox24.8%5Cpm2.68%5C%5C%5C%5C%3D%2824.8-2.68%2C%2024.8%2B2.68%29%3D%2822.12%2C%2027.48%29)
Hence, the 95% confidence interval, assuming the times are normally distributed.= (22.12, 27.48)
Answer:
10
Step-by-step explanation:
abolute value= distance from zero 10 is 10 away from 0