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; 3.1; 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 Construct a 95% confidence interval for the population mean length of time. (i) State the confidence interval. (Round your answers to two decimal places.) (ii) part b Sketch the graph. a/2 = CL= a/2 = part c iii) Calculate the error bound. (Round your answer to two decimal places.) Part (d What does it mean to be "95% confident" in this problem? This means that the chances of a tranquilizer being effective is 95%. 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. We are 95% confident that the effectiveness of a tranquilizer lies between the interval values. This means that if intervals are created from repeated samples, 95% of them will contain the true population average length of effectiveness of tranquilizers.
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; 3.1; 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 Construct a 95% confidence interval for the population mean length of time. (i) State the confidence interval. (Round your answers to two decimal places.) (ii) part b Sketch the graph. a/2 = CL= a/2 = part c iii) Calculate the error bound. (Round your answer to two decimal places.) Part (d What does it mean to be "95% confident" in this problem? This means that the chances of a tranquilizer being effective is 95%. 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. We are 95% confident that the effectiveness of a tranquilizer lies between the interval values. This means that if intervals are created from repeated samples, 95% of them will contain the true population average length of effectiveness of tranquilizers.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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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 9 patients. The effective period of the tranquilizer for each patient (in hours) was as follows: 2.6; 2.8; 3.1; 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 Construct a 95% confidence interval for the population
mean length of time.
(i) State the confidence interval. (Round your answers to two decimal places.)
(ii) part b Sketch the graph.
a/2 =
CL=
a/2 =
- part c iii) Calculate the error bound. (Round your answer to two decimal places.)
- Part (d
What does it mean to be "95% confident" in this problem? - This means that the chances of a tranquilizer being effective is 95%.
- 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.
- We are 95% confident that the effectiveness of a tranquilizer lies between the interval values.
- 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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