Answered: A random sample of 16 pharamcy…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Topic Video

Question

A random sample of 16 pharamcy customers showed the waiting times below (in minutes)

15, 12, 17, 17, 14, 16, 17, 22, 19, 23, 14, 25, 17 ,12, 17 ,18

Find a 90 percent confidence interval for u, assuming that the sample is from a normal population. (Round your standard deviation answer to 4 decimal places and t-value to 3 decimal places. Round your answers to 3 decimal places.)

The 90% confidence interval ____ to ____

Expert Solution

Working

X	(x-xbar)^2
15	3.24
12	23.04
17	0.04
17	0.04
14	7.84
16	0.64
17	0.04
22	27.04
19	4.84
14	7.84
25	67.24
17	0.04
12	23.04
17	0.04
18	1.44

The mean is given by

$\overline{x} = \frac{1}{n}\sum x$

$\overline{x} =\frac{252}{15} =16.8$

The standard deviation is given by

$\sigma =\sqrt{\frac{1}{n-1}\sum (x - \overline{x})^2}$

$\sigma =\sqrt{\frac{166.4}{14}} =3.4476$

Step by step

Solved in 2 steps with 7 images

Knowledge Booster

$Hypothesis Tests and Confidence Intervals for Means$

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.

Similar questions