A pharmaceutical company makes tranquilizers. It is assumed that the distribution for the length of time they last is approximately normal. Researchers in a hospital used the drug on a random sample of nine patients. The effectiveness periods of the tranquilizer for each patient (in hours) were as follows: 2.7, 2.8, 3.0, 2.3, 2.3, 2.2, 2.8, 2. 1and 2.4. If the error bound is 0.2444, then the level of confidence interval of the mean is: None of the other options 0.99 O 0.98 0.95

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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A pharmaceutical company makes tranquilizers. It is assumed that the distribution for the
length of time they last is approximately normal. Researchers in a hospital used the drug
on a random sample of nine patients. The effectiveness periods of the tranquilizer for
each patient (in hours) were as follows: 2.7, 2.8, 3.0, 2.3, 2.3, 2.2, 2.8, 2.1and 2.4. If the
error bound is 0.2444, then the level of confidence interval of the mean is:
None of the other options
0.99
0.98
0.95
Transcribed Image Text:A pharmaceutical company makes tranquilizers. It is assumed that the distribution for the length of time they last is approximately normal. Researchers in a hospital used the drug on a random sample of nine patients. The effectiveness periods of the tranquilizer for each patient (in hours) were as follows: 2.7, 2.8, 3.0, 2.3, 2.3, 2.2, 2.8, 2.1and 2.4. If the error bound is 0.2444, then the level of confidence interval of the mean is: None of the other options 0.99 0.98 0.95
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