11. 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 9 patients. The effective period of the tranquilizer for each patient (in hours) was as follows: 2.6; 2.8; 3.0; 2.3; 2.3; 2.2; 2.8; 2.1; and 2.4. Construct a 95% confidence interval for the population mean length of time. (i) State the confidence interval (Round your answer to two decimal places.) (ii) Calculate the error bound. (Round your answer to two decimal places.)

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11. 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 9 patients. The effective period of the tranquilizer for each patient (in hours)
was as follows: 2.6; 2.8; 3.0; 2.3; 2.3; 2.2; 2.8; 2.1; and 2.4.
Construct a 95% confidence interval for the population mean length of time.
(i)
State the confidence interval (Round your answer to two decimal places.)
(ii)
Calculate the error bound. (Round your answer to two decimal places.)
Transcribed Image Text:Adobe PDF Signatures Paragraph Styles Editing Adobe Acrobat Voi 11. 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 9 patients. The effective period of the tranquilizer for each patient (in hours) was as follows: 2.6; 2.8; 3.0; 2.3; 2.3; 2.2; 2.8; 2.1; and 2.4. Construct a 95% confidence interval for the population mean length of time. (i) State the confidence interval (Round your answer to two decimal places.) (ii) Calculate the error bound. (Round your answer to two decimal places.)
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