1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Anit [1.1K]
3 years ago
9

The desired percentage of SiO2 in a certain type of aluminous cement is 5.5. To test whether the true average percentage is 5.5

for a particular production facility, 16 independently obtained samples are analyzed. Suppose that the percentage of SiO2 in a sample is normally distributed with and that . a. Does this indicate conclusively that the true average percentage differs from 5.5

Mathematics
2 answers:
Musya8 [376]3 years ago
6 0

Answer:

Step-by-step explanation:

This is a test of mean where σ, the population standard deviation is known. The null hypothesis H₀ : µ =  µ₀ = 5.5; the alternative H₁ : µ ≠ µ₀. Since σ is known, z =  (x − µ₀

)/(σ/√n)   is normally distributed for all n and so,  for a two-tailed test, we reject H₀ if z ≥ z(α/2) or z ≤ −z(α/2). In this case, α = 0.05 so z(α/2) = z(.025) = 1.960.

P = 2P (Z ≥ |z|) = 2P

*(Z ≥  (x − µ₀)/(

σ/√

n))

⇒  P = 2P

*(Z ≥  (5.25 − 5.5)/(

0.32/√16))  = 2P

*(Z ≥  -3.125)  = 2*(0.9991) = 1.9982

We reject the null hypothesis that the true average is 5.5.

Ket [755]3 years ago
3 0

Answer:

since p value < x(0.05) so we reject the null hypothesis

step 5 ( conclusion)

reject the null hypothesis and there is sufficient evidence to support the claim that the true average percentage differs from 5.5.

Step-by-step explanation:

   

check the attachment for detailed explanation

You might be interested in
HHHHHHEEEELLLLLLPPPPP
sveticcg [70]
<span>We want to check how many intersections line A and B have, that is, we want to check how many common solutions do these equations have:
</span>
i) 2x + 2y = 8

ii) x + y = 4
<span>
use equation ii) to write y in terms of x as : y=4-x, 

substitute y =4-x in equation i):

</span>2x + 2y = 8
2x + 2(4-x) = 8
<span>2x+8-2x=8
8=8

this is always true, which means the equations have infinitely many common solutions.


Answer: </span><span>There are infinitely many solutions.</span><span>

</span>
4 0
3 years ago
What is <br> 1 + 1<br> 2 + 2 <br> 4 + 4<br> 8 + 8<br> 16 + 16<br> Btw chat room for all!!
DENIUS [597]

OH i know this one! i know this one!!

* grabs my notebook and a pencil and lays on the floor* hm... its

2

4

8

16

32

yay!! lol this was me lol

7 0
3 years ago
Read 2 more answers
I was wondering what the answer to these problems is?
alina1380 [7]
The first one is 4
Second is 5/9
Third is 1/2
Fourth is 11
7 0
2 years ago
Read 2 more answers
The sector of a circle with a 60 millimeters radius has a central angle measure of 30° . What is the exact area of the sector in
ASHA 777 [7]
R = 60
60^2 * pi = 3600 * pi
angle = 30°
3600pi / 30 = 120pi
the answer is 120 * pi
7 0
3 years ago
Use intercepts to graph the linear equation<br> -2 + 2y = 7.
cricket20 [7]

Answer:

2y=7+2

2y=9

y=9/2

4.5

i hope to help you

3 0
3 years ago
Other questions:
  • The measure of one side of a square is (s + 3) inches long.Writes two different equivalent expressions that represent the perime
    5·1 answer
  • Find the hypotenuse,c, of the triangle!
    6·1 answer
  • Write an expression for the verbal phrase:
    10·2 answers
  • What are the solutions
    8·2 answers
  • Fill in the other coordinate for the line 2x - 5y = 11: (4, )
    9·1 answer
  • What is the percent of 12000 to 150
    9·1 answer
  • Equivalent ratio for 5:9
    7·1 answer
  • Alexa drew AB on a piece of a paper, and then folded the paper so that Point A was on Point B. She claims the crease forms right
    9·1 answer
  • Please please help I’ll give the brain thing if you help but you need to have a correct answer + explain thanks :)))
    9·1 answer
  • Please help asap!!!!
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!