Business, 20.05.2021 18:10, shanasia76

A company wants to determine if the average shearing strength of all rivets manufactured is more than 1000 lbs. A sample of 25 rivets is selected and tested for the shearing strength. After calculation, the mean shearing strength of these 20 selected rivets is 1003.8 lbs and a 99% confidence interval is (1001.4, 1006.2) for the average shearing strength of all rivets manufactured. Which of the following statement is true? A- The average shearing strength of all rivets manufactured is1003.8lbs.
B- The average shearing strength of all rivets manufactured must be between 1001.4 and1006.2.
C- We are 99% confident that the average shearing strength of all rivets manufactured is more than 1000 lbs.
D- At 90% confidence level, we know that the average shearing strength of all rivets manufactured is between 1001.4 and 1006.2 lbs.

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A company wants to determine if the average shearing strength of all rivets manufactured is more tha...