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8. [-/1 Points] DETAILS ILLOWSKYINTROSTAT1 8.HW. 107. MY NOTES 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. NOTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) Part (a) (i) Round your answer to two decimal places. X = (rounded to two decimal places) (ii) Round your answer to two decimal places. SX= (rounded to two decimal places) (ii) Enter an exact number as an integer, fraction, or decimal. n = (iv) Enter an exact number as an integer, fraction, or decimal. n - 1= Part (b) In words, define the random variable X. O the number of tranquilizers the hospital used for each patient O time, in minutes, of the effectiveness of a tranquilizer O time, in hours, of the effectiveness of a tranquilizer the number of patients that were given a tranquilizer