Answer:18
Step-by-step explanation:
you have $18 dollars left
Answer:
2150 maybe
Step-by-step explanation:
Answer:
a) n = 100
![\bar{x} = 58](https://tex.z-dn.net/?f=%5Cbar%7Bx%7D%20%3D%2058)
s = 8
Confidence interval = 95%
Z at 95% = 1.96
Confidence interval formula :
to ![\bar{x}-z\frac{s}{\sqrt{n}}](https://tex.z-dn.net/?f=%5Cbar%7Bx%7D-z%5Cfrac%7Bs%7D%7B%5Csqrt%7Bn%7D%7D)
Substitute the values :
Confidence interval :
to ![58+1.96 \times \frac{8}{\sqrt{100}}](https://tex.z-dn.net/?f=58%2B1.96%20%5Ctimes%20%5Cfrac%7B8%7D%7B%5Csqrt%7B100%7D%7D)
Confidence interval :
to ![59.568](https://tex.z-dn.net/?f=59.568)
b)n = 200
![\bar{x} = 62](https://tex.z-dn.net/?f=%5Cbar%7Bx%7D%20%3D%2062)
s =11
Confidence interval = 90%
Z at 90% = 1.64
Confidence interval formula :
to ![\bar{x}-z\frac{s}{\sqrt{n}}](https://tex.z-dn.net/?f=%5Cbar%7Bx%7D-z%5Cfrac%7Bs%7D%7B%5Csqrt%7Bn%7D%7D)
Substitute the values :
Confidence interval :
to
Confidence interval :
to ![63.275](https://tex.z-dn.net/?f=63.275)