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3 years ago

Hi i just wanna know if i'm right on this math question Thank you.

Mathematics

1 answer:

Stolb23 [73]3 years ago

6 0

Answer:

Correct my guy or gal.

Step-by-step explanation:

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Suppose we take a random sample of 41 state college students. Then we measure the length of their right foot in centimeters. We

Debora [2.8K]

Answer:

$ME = \frac{25.09-21.01}{2}= 1.69$

The general formula for the margin of error is given by:

$ME= t_{\alpha/2} \frac{s}{\sqrt{n}}$

And for this case the width is:

$Width= 2*t_{\alpha/2} \frac{s}{\sqrt{n}}$

And if we decrease the confidence level from 95% to 90% then the critical value $t_{\alpha/2}$ would decrease and in effect the width for this new confidence interval decreases.

As confidence level decreases, the interval width decreases

Step-by-step explanation:

For this cae we know that the sample size selected is n =41

And we have a confidence interva for the true mean of foot length for students at a college selected.

The confidence interval is given by this formula:

$\bar X \pm t_{\alpha/2} \frac{s}{\sqrt{n}}$

And for this case the 95% confidence interval is given by: (21.71,25.09)

A point of etimate for the true mean is given by:

$\bar X = \frac{21.71+25.09}{2}= 23.4$

And the margin of error would be:

$ME = \frac{25.09-21.01}{2}= 1.69$

The general formula for the margin of error is given by:

$ME= t_{\alpha/2} \frac{s}{\sqrt{n}}$

And for this case the width is:

$Width= 2*t_{\alpha/2} \frac{s}{\sqrt{n}}$

And if we decrease the confidence level from 95% to 90% then the critical value $t_{\alpha/2}$ would decrease and in effect the width for this new confidence interval decreases.

As confidence level decreases, the interval width decreases

3 0

3 years ago

What is the slope of the line that contains these points?

sertanlavr [38]

Formula to find the slope (y1-y2)/(x1-x2)
if (x1,y1) is (13,2) and (x2,y2) is (15,14)
(2-14)/(13-15)=6

3 0

3 years ago

If x is 50 then what is x4+44+3.5

lesantik [10]

The answer is: " 10,047.5 " .
_______________________________
Explanation:
________________________________
Given: " x⁴ + 44 + 3.5 " ; and given: "x = 50" ;

we can plug in "50" for "x" ; and solve:
________________________________________
10⁴ + 44 + 3.5 ;

= 10,000 + 44 + 3.5 ;

= 10,047.5
________________________________________

5 0

3 years ago

A ball rolls down an inclined plane such that the distance (in centimeters) that it rolls in t seconds is given by s(t) = 2t^3 +

IRISSAK [1]

The ball's velocity will be represented by the derivative of its distance function:

$s'(t)=6t^2+6t$

Now find the times $t$ for which this is equal to 30, i.e. solve

$6t^2+6t=30\implies t^2+t-5=0$

This has two solutions, $t=-\dfrac{1\pm\sqrt{21}}2$ , but only one is positive and falls in the interval $[0,3]$ . So the velocity reaches 30 cm/s when $t=-\dfrac{1-\sqrt{21}}2\approx1.79$ .

3 0

3 years ago

Again you don’t need to answer all of them but if you can do some that would be wonderful!

Maru [420]

Answer:

17) x=7

18) x= -26

19) x= -8

20) x= 6

Step-by-step explanation:

17) is congruent

18) is supplementary

19) is congruent

20) is congruent

8 0

3 years ago

Read 2 more answers