Multiple Choice
A bank is trying to determine which model of safe to install. The bank manager believes that each model is equally resistant to safe crackers but sets up a test to be sure. He hires nine safe experts to break into each of the models, timing each endeavor. The results (in seconds) are given next, paired by expert. Let D be the difference: Time to break Safe 1 minus Time to break Safe 2. ![A bank is trying to determine which model of safe to install. The bank manager believes that each model is equally resistant to safe crackers but sets up a test to be sure. He hires nine safe experts to break into each of the models, timing each endeavor. The results (in seconds) are given next, paired by expert. Let D be the difference: Time to break Safe 1 minus Time to break Safe 2. Assuming the difference D is normally distributed, which of the following is the 95% confidence interval for μ<sub>D</sub>? A) [-1.7537, 5.7537] B) [-1.1459, 5.1459] C) [-0.6739, 4.6739] D) [-0.5368, 4.5368]](https://d2lvgg3v3hfg70.cloudfront.net/TB6618/11ea8309_a8cf_b3f5_b223_c1cc9af65ea9_TB6618_00.jpg)
Assuming the difference D is normally distributed, which of the following is the 95% confidence interval for μD?
A) [-1.7537, 5.7537]
B) [-1.1459, 5.1459]
C) [-0.6739, 4.6739]
D) [-0.5368, 4.5368]
Correct Answer:
Verified
Correct Answer:
Verified
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