This topic contains a solution. Click here to go to the answer

Author Question: When 12 bolts are tested for hardness, their indexes have a standard deviation of 41.7. Test the ... (Read 50 times)

Medesa

  • Hero Member
  • *****
  • Posts: 507
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
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
YES! Correct, THANKS for helping me on my review


mammy1697

  • Member
  • Posts: 341
Reply 3 on: Yesterday
Great answer, keep it coming :)

 

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

Did you know?

Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

Did you know?

Women are 50% to 75% more likely than men to experience an adverse drug reaction.

Did you know?

Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

Did you know?

In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

For a complete list of videos, visit our video library