A pharmaceutical company makes tranquilizers. It is assumed that the distributio

Question

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: 2.7; 2.8; 3.0; 2.3; 2.3; 2.2; 2.8; 2.1; and 2.4.

What does it mean to be "95% confident" in this problem?  a.This means that we are 95% confident that the average length of effectiveness of tranquilizers in the sample of 9 people is between the interval values.  b.We are 95% confident that the effectiveness of a tranquilizer lies between the interval values c.This means that if intervals are created from repeated samples, 95% of them will contain the true population average length of effectiveness of tranquilizers. d.This means that the chances of a tranquilizer being effective is 95%.

Explanation / Answer

option C is correct

c.This means that if intervals are created from repeated samples, 95% of them will contain the true population average length of effectiveness of tranquilizers.

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