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4 years ago

Amanda recorded the temperatures at which two oils freeze:

Mathematics

1 answer:

max2010maxim [7]4 years ago

6 0

The only thing that we have to say was 4.5 425 6:63

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The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of each brand at random to the

Darya [45]

Answer:

Brand 1 Brand 2 Difference

37734 35202 2532

45299 41635 3664

36240 35500 740

32100 31950 150

37210 38015 −805

48360 47800 560

38200 37810 390

33500 33215 285

Sum of difference = 2532+ 3664+740+150 −805+ 560 +390 +285 = 7516

Mean = $d=\frac{7516}{8}$

Mean = $d=939.5$

a) d= 939.5

$\text{Sample Standard deviation, s} = \sqrt{\dfrac{(x-\bar{x})^2}{n-1}}$

$=\sqrt{\dfrac{(2532-939.5)^2+(3664-939.5)^2+(740-939.5)^2 ...+(285-939.5)^2}{8-1}}$

=1441.21

b)SD= 1441.21

c)Calculate a 99% two-sided confidence interval on the difference in mean life.

confidence level =99%

significance level =α= 0.01

Degree of freedom = n-1 = 8-1 =7

So, $t_{\frac{\alpha}{2}}=3.499$

Formula for confidence interval $= \left( \bar{X} \pm t_{\frac{\alpha}{2}} \times \frac{s}{\sqrt{n}} \right)$

Substitute the values

confidence interval $= 939.5 \pm 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$

confidence interval $= 939.5 - 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$ to $= 939.5 + 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$

Confidence interval $−843.396\$ to $2722.396$

8 0

3 years ago

Identify the vertex of the function graphed below.

MariettaO [177]

The answer is D, (2,2). A vertex is where a line or curve meets and changes direction.

4 0

3 years ago

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Is it possible to form a triangle with<br> side lengths 5, 3, and 5 units?

7nadin3 [17]

Answer:

Yes

Step-by-step explanation:

Isosceles triangle with base of 3 units and sides of 5 units

8 0

3 years ago

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7/10 of 120 and show work pls

slavikrds [6]

When it says 7/10, it actually means 70%, so you have to find 70% of 120.
<span>
70 % of 120
= 70% x 120
= (70/100) x 120
= (8400/100)
= 84

Answer: 84</span>

8 0

3 years ago

The parallelogram shown represents a map of the boundaries of a natural preserve. Walking trails run from points A to C and from

Citrus2011 [14]

y+2 = 3y-4 =

y+6 = 3y

6 =2y

y = 3

y+2 = 3+2 = 5

3y-4 = 3(3)-4 = 5

5+5 =10

2y-3 = 2(3) - 3 = 3

3+3 = 6

10+6 = 16 miles

answer is C

4 0

4 years ago

Read 2 more answers