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Author Question: A sample of 49 measurements of tensile strength for roof hangers are calculated to have a mean of ... (Read 85 times)

gbarreiro

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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


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Viet Thy

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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

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Reply 2 on: Jun 24, 2018
YES! Correct, THANKS for helping me on my review

xiazhe

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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