This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: When 12 bolts are tested for hardness, their indexes have a standard deviation of 41.7. Test the ... (Read 59 times)

Medesa

  • Hero Member
  • *****
  • Posts: 507
on: Aug 1, 2018
When 12 bolts are tested for hardness, their indexes have a standard deviation of 41.7. Test the claim that the standard deviation of the hardness indexes for all such bolts is greater than 30.0. Use a 0.025 level of significance.
 
  What will be an ideal response?

Question 2

Focus groups of 11 people are randomly selected to discuss products of the Yummy Company. It is determined that the mean number (per group) who recognize the Yummy brand name is 8.3, and the standard deviation is 0.88.
 
  Would it be unusual to randomly select 11 people and find that fewer than 5 recognize the Yummy brand name?
  A) Yes B) No


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

tdewitt

  • Sr. Member
  • ****
  • Posts: 318
Reply #1 on: Aug 1, 2018
Answer to Question 1

Test statistic: X2 = 21.253. Critical value: X2 = 21.920. Fail to reject the null hypothesis. There is not sufficient evidence to support the claim that the standard deviation is greater than 30.0.

Answer to Question 2

A


Medesa

  • Member
  • Posts: 507
Reply 2 on: Aug 1, 2018
Gracias!

vickybb89

  • Member
  • Posts: 347
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

Did you know?

Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

Did you know?

As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Did you know?

Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

Pregnancy test Pregnancy test
Are the resutls from the glucose strip test consistent with the results obtained from the ... Are the resutls from the glucose strip test consistent with the results obtained from the ...
(a) The connection required to test a Halleffect sensor. (b) A typical waveform from a Hall-effect ... (a) The connection required to test a Halleffect sensor. (b) A typical waveform from a Hall-effect ...
Cylinder Power Balance Test Cylinder Power Balance Test
A hypothesis test is performed to test the claim that a population proportion is greater than ... A hypothesis test is performed to test the claim that a population proportion is greater than ...
A test field of GM papaya A test field of GM papaya
Video: Neuron Structure Animation

For a complete list of videos, visit our video library