After reading "The Portable Lighting Project" After reading "The Portable Lighting Project": B. Innovation puts entertainment first.
Flashlight (USA, Canada) or Torch (UK, Australia) - A portable, portable electric lamp. Previously, the light source was usually a small incandescent light bulb, but since the mid-2000s, it has been replaced by an LED (Light Emitting Diode).
Portable lighting simply refers to a device that can be moved from one place to another when connected to a power source. It can be easily removed from the support by hand. Portable is something you can easily move from place to place. A small radio that can be easily moved is an example of what could be considered portable.
Examples include portable USB or flash keys, memory cards, smartphones, tablets, laptops, notebooks, personal digital assistants, MP3 players, iPods, rewritable CDs, e-readers, and other devices with built-in storage available. PSDs are becoming more common in the workplace.
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Answer:
1. Co-variance= -1.2
2. correlation coefficient= -0.4404
3. There is weak negative relationship between x and y.
Explanation:
1.
Co-variance= Cov(x,y)= sum[(x-xbar)(y-ybar)]/n
xbar=sumx/n=32/5=6.4
ybar=sumy/n=35/5=7
x 7 8 5 3 9
x-xbar 0.6 1.6 -1.4 -3.4 2.6
y 7 5 9 7 7
y-ybar 0 -2 2 0 0
(x-xbar)(y-ybar) 0 -3.2 -2.8 0 0
Cov(x,y)= sum[(x-xbar)(y-ybar)]/n=-6/5=-1.2
Cov(x,y)=-1.2
2.
correlation coefficient=r
x 7 8 5 3 9
x-xbar 0.6 1.6 -1.4 -3.4 2.6
y 7 5 9 7 7
y-ybar 0 -2 2 0 0
(x-xbar)(y-ybar) 0 -3.2 -2.8 0 0
(x-xbar)² 0.36 2.56 1.96 11.56 6.76
(y-ybar)² 0 4 4 0 0
r=-0.4404
3. Since the value of correlation coefficient is negative and less than 0.5 , so, we can say that there is weak negative relationship between x and y.
Identifying a need or problem,identifying your choices,evaluating your choices,getting info about choices from diff sources,analyzing your resources,making a decision and taking an action?
This Christmas Carol is "God Rest Ye Merry Gentlemen".
The full verse is as follows:
God rest ye merry gentlemen, let nothing you dismay, hey
Remember Christ ,our savior was born on Christmas Day
To save us all from Satan's power when we were gone astray
