Three confidence intervals for the mean shear strength (in

Chapter 5, Problem 9SE

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QUESTION:

Three confidence intervals for the mean shear strength (in ksi) of anchor bolts of a certain type are computed, all from the same sample. The intervals  are (4.01, 6.02), (4.20, 5.83), and (3.57, 6.46). The levels of the intervals are 90%, 95%, and 99%. Which interval has which level?

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QUESTION:

Three confidence intervals for the mean shear strength (in ksi) of anchor bolts of a certain type are computed, all from the same sample. The intervals  are (4.01, 6.02), (4.20, 5.83), and (3.57, 6.46). The levels of the intervals are 90%, 95%, and 99%. Which interval has which level?

ANSWER:

Answer:

Step 1 of 1:

Three confidence intervals for the mean shear strength are computed, all from the same sample. The intervals are , , and . the levels of the intervals are 90%, 95%, and 99%.

Which interval has which level?

Lets plot the normal probability density function with mean  and standard deviation

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