1. Question Details DevoreStat9 7.SE.506.XP. [4060976] The following observations were made on fracture toughness of a base plate of 18% nickel maraging steel (in ksi ✓in., given in increasing order)]: 65.5 71.9 72.8 73.1 73.4 73.5 75.5 75.7 75.8 76.1 76.2 76.2 77.0 77.9 78.1 79.6 79.7 79.9 80.1 82.2 83.7 93.8 Calculate a 99% CI for the standard deviation of the fracture toughness distribution. (Round your answers to one decimal place.) 3.8 8.7 ksi vin Is this interval valid whatever the nature of the distribution? Explain. O The interval is always valid. The distribution needs to be skewed to the right. O The distribution needs to be approximately uniform. O The distribution needs to be approximately normal.
1. Question Details DevoreStat9 7.SE.506.XP. [4060976] The following observations were made on fracture toughness of a base plate of 18% nickel maraging steel (in ksi ✓in., given in increasing order)]: 65.5 71.9 72.8 73.1 73.4 73.5 75.5 75.7 75.8 76.1 76.2 76.2 77.0 77.9 78.1 79.6 79.7 79.9 80.1 82.2 83.7 93.8 Calculate a 99% CI for the standard deviation of the fracture toughness distribution. (Round your answers to one decimal place.) 3.8 8.7 ksi vin Is this interval valid whatever the nature of the distribution? Explain. O The interval is always valid. The distribution needs to be skewed to the right. O The distribution needs to be approximately uniform. O The distribution needs to be approximately normal.
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DevoreStat9 7.SE.506.XP. [4060976]
The following observations were made on fracture toughness of a base plate of 18% nickel maraging steel (in ksi ✓in.,
given in increasing order)]:
65.5 71.9 72.8 73.1 73.4 73.5 75.5 75.7 75.8 76.1 76.2
76.2 77.0 77.9 78.1 79.6 79.7 79.9 80.1 82.2 83.7 93.8
Calculate a 99% CI for the standard deviation of the fracture toughness distribution. (Round your answers to one decimal
place.)
3.8
8.7 ksi vin
Is this interval valid whatever the nature of the distribution? Explain.
O The interval is always valid.
O The distribution needs to be skewed to the right.
O The distribution needs to be approximately uniform.
O The distribution needs to be approximately normal.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F05306099-d17b-4786-a552-6aca0323abbc%2Fd963c202-eb71-46c3-9706-5a588bec689c%2F3twzequ_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1.
Question Details
DevoreStat9 7.SE.506.XP. [4060976]
The following observations were made on fracture toughness of a base plate of 18% nickel maraging steel (in ksi ✓in.,
given in increasing order)]:
65.5 71.9 72.8 73.1 73.4 73.5 75.5 75.7 75.8 76.1 76.2
76.2 77.0 77.9 78.1 79.6 79.7 79.9 80.1 82.2 83.7 93.8
Calculate a 99% CI for the standard deviation of the fracture toughness distribution. (Round your answers to one decimal
place.)
3.8
8.7 ksi vin
Is this interval valid whatever the nature of the distribution? Explain.
O The interval is always valid.
O The distribution needs to be skewed to the right.
O The distribution needs to be approximately uniform.
O The distribution needs to be approximately normal.
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