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
GalinKa [24]
3 years ago
12

The breaking strengths of cables produced by a certain manufacturer have a mean, u, of 1750 pounds, and a standard deviation of

65 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength. To evaluate this claim, 100 newly manufactured cables are randomly chosen and tested, and their mean breaking strength is found to be 1754 pounds. Can we support, at the 0.1 level of significance, the claim that the mean breaking strength has increased
Mathematics
1 answer:
AlladinOne [14]3 years ago
8 0

Answer:

We accept the null hypothesis that the  breaking strength mean is less and equal to 1750 pounds and has not increased.

Step-by-step explanation:

The null and alternative hypotheses are stated as

H0:  u ≥ 1750   i.e the mean is less and equal to 1750

against the claim

Ha: u > 1750  ( one tailed test)  the mean is greater than 1750

Sample mean = x`= 1754

Population mean = u = 1750

Population deviation= σ = 65 pounds

Sample size= n = 100

Applying the Z test

z= x`- u / σ/ √n

z= 1754- 1750 / 65/ √100

z= 4/6.5

z= 0.6154

The significance level alpha = 0.1

The z - value at 0.1 for one tailed test is ± 1.28

The critical value is z > z∝.

so

0.6154 is < 1.28

We accept the null hypothesis that the  breaking strength mean is less and equal to 1750 pounds and has not increased.

You might be interested in
At a museum 100 posters are displayed in each of four rooms altogether how many posters are displayed
aleksandr82 [10.1K]
25 posters in each room.
5 0
3 years ago
Select all of the potential solution(s) of the equation 2log5x=log54.
Ilya [14]
X= -2 and x= 2 are the answers
8 0
3 years ago
Read 2 more answers
Use the order of operations to simplify this expression <br> |7-8|•4+3(-1)
kkurt [141]
1 is the answer 1111111111
3 0
3 years ago
Lori bought a shirt and a hat at half-off sale. If she spent a total of $21 on the two items, what was the original price of the
Rzqust [24]

Answer:

41

Step-by-step explanation:

first you do 21×2 and that's literally it

3 0
2 years ago
Ali runs next to one wall in a gym. The gym is
DiKsa [7]
<h2><em>Answer:</em></h2><h2><em>=</em><em>12</em></h2><h2><em>12step</em><em> </em><em>by step explanation:</em></h2><h2><em>=</em><em>solution:</em></h2><h2><em>solution: area of gym= 144</em></h2><h2><em>solution: area of gym= 144we know that,</em></h2><h2><em>solution: area of gym= 144we know that, area of square= L²</em></h2><h2><em>solution: area of gym= 144we know that, area of square= L² or,144= L²</em></h2><h2><em>solution: area of gym= 144we know that, area of square= L² or,144= L² or, (12)² = L²(12² means 12×12=144)</em></h2><h2><em>solution: area of gym= 144we know that, area of square= L² or,144= L² or, (12)² = L²(12² means 12×12=144) or, 12= L </em></h2><h2><em>solution: area of gym= 144we know that, area of square= L² or,144= L² or, (12)² = L²(12² means 12×12=144) or, 12= L therefore, L = 12 </em></h2>
7 0
2 years ago
Other questions:
  • A=6 cm,b=9cm,and c =3 cm
    15·1 answer
  • Given the graph of a function f(x). What is f(-4)?
    8·1 answer
  • What is 2.23 as a fraction
    5·2 answers
  • P is a point on CD. If CP : PD is 7 : 2 and CD is 54, what are the lengths of CP and PD?
    13·1 answer
  • PLEASE HELP I WILL MARK BRAINLIEST
    7·1 answer
  • Lisa has three classes that each last 50 minutes what is the total number of minutes that the classes last
    11·2 answers
  • It costs$15 to send 3 packages through a certain shipping company Consider the number of packages per dollar.
    5·1 answer
  • Whats 8 over x-2 =24 over 7 in solving proportions NO LINKS
    13·1 answer
  • What is the measure of &lt;2
    7·1 answer
  • What percent of<br> 950 is 36?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!