As the Carbon Content in Steel Increases, Its Ductility Tends

question 3

Multiple Choice

As the carbon content in steel increases, its ductility tends to decrease.A researcher at a steel company measures carbon content and ductility for a sample of 15 types of
Steel.The estimated regression equation fit to the data was found to be significant at α =
0) 05.The 95% prediction interval for the ductility of steel with 0.5% carbon content was
Determined to be 0.45 to 11.59.The correct interpretation is

• A)We can be 95% confident that the ductility of a particular type of steel with 0.5%
• B)We can be 95% confident that the average ductility of all steel with 0.5% carbon
• C)The ductility of steel with 0.5% carbon content will be between 45 and 11.59 most
• D)95% of the time the average ductility of steel with 0.5% carbon content will be
• E)We can be 95% confident that all steel with have ductility measurements between 0.45 and 11.59.

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