Y=3x-5 graphing a linear equation

1 answer:

7 0

When graphing Y=3X-5 you want to start looking at the Y axis or the vertical line that goes up and down. You need to draw your first point or dot on the vertical line starting at negative five (-5). Then you start to go up 3 boxes and over 1 box or to the right one box because the equation has 3x in it . So after starting at negative 5 you want to travel up 3 and over 1, up three and over 1, do this until your graph can no longer go on or is not bug enough. Did i answer your question?

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9.4 The heights of a random sample of 50 college stu- dents showed a mean of 174.5 centimeters and a stan- dard deviation of 6.9

gladu [14]

Answer: a) (176.76,172.24), b) 0.976.

Step-by-step explanation:

Since we have given that

Mean height = 174.5 cm

Standard deviation = 6.9 cm

n = 50

we need to find the 98% confidence interval.

So, z = 2.326

(a) Construct a 98% confidence interval for the mean height of all college students.

$x\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=(174.5\pm 2.326\times \dfrac{6.9}{\sqrt{50}})\\\\=(174.5+2.26,174.5-2.26)\\\\=(176.76,172.24)$

(b) What can we assert with 98% confidence about the possible size of our error if we estimate the mean height of all college students to be 174.5 centime- ters?

Error would be

$\dfrac{\sigma}{\sqrt{n}}\\\\=\dfrac{6.9}{\sqrt{50}}\\\\=0.976$

Hence, a) (176.76,172.24), b) 0.976.

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3 years ago