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 effective period of the tranquilizer for each patient (in hours) was as follows: 2.7; 2.8; 3.0; 2.3; 2.3; 2.23 2.83; 2.13; and 2.4. a. Identify the following. x - = ___ sx =___ n =___ n-1 = ___

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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 effective period of the tranquilizer for each patient (in hours) was as follows: 2.7; 2.8; 3.0; 2.3; 2.3; 2.23 2.83; 2.13; and 2.4.

a. Identify the following.

- = ___
sx =___

n =___

n-1 = ___

b. Which distribution should you use for this problem? Explain your choice.
c. Construct a 95% confidence interval for the population mean length of
time. State the confidence interval and calculate the error bound.
 

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