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

Author Question: A sample of 49 measurements of tensile strength for roof hangers are calculated to have a mean of ... (Read 38 times)

gbarreiro

  • Hero Member
  • *****
  • Posts: 566
on: Jun 24, 2018
A sample of 49 measurements of tensile strength for roof hangers are calculated to have a mean of 2.45 and a standard deviation of 0.25 . (Units are Newton's per square meter.)
 a. Determine the 95 confidence interval for mean tensile strength for all hangers.
  b. Interpret this confidence interval.

Question 2

Multicollinearity is present if the dependent variable is linearly related to one of the explanatory variables.
  Indicate whether the statement is true or false


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Viet Thy

  • Sr. Member
  • ****
  • Posts: 329
Reply #1 on: Jun 24, 2018
Answer to Question 1

a. LCL = 2.38 and UCL = 2.52 (Newton's per square meter).
b. I estimate the mean tensile strength for all roof hangars to be between 2.38 and 2.52 Newton's per square meter, based on my sample. We know that 95 of the time the true population mean would fall in the resulting interval.

Answer to Question 2

F


gbarreiro

  • Member
  • Posts: 566
Reply 2 on: Jun 24, 2018
Wow, this really help

Chelseyj.hasty

  • Member
  • Posts: 319
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Did you know?

Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

Did you know?

Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

Measurements of solar cycle variation during the last 30 years Measurements of solar cycle variation during the last 30 years
Improving Muscular Strength and Endurance Improving Muscular Strength and Endurance
Sample Program for Changing Daily Caloric Intake (cont.) Sample Program for Changing Daily Caloric Intake (cont.)
How long does it take for 90% of a sample of strontium-90 (half-life of 28.8 years) to decay? How long does it take for 90% of a sample of strontium-90 (half-life of 28.8 years) to decay?
Sample prescriptions of drugs for oral fungal infections. Sample prescriptions of drugs for oral fungal infections.
Sample time management planning chart for a massage student. Sample time management planning chart for a massage student.
Video: Simple and Double Sugar

For a complete list of videos, visit our video library