Concept explainers
To find: The confidence interval.
Answer to Problem 81E
The confidence interval is
Explanation of Solution
Given:
Data:
11.627 |
11.613 |
11.493 |
11.602 |
11.36 |
11.374 |
11.592 |
11.458 |
11.552 |
11.463 |
11.383 |
11.715 |
11.485 |
11.509 |
11.429 |
11.477 |
11.57 |
11.623 |
11.472 |
11.531 |
Formula:
The confidence interval for population mean is:
Calculation:
The sample mean and standard deviation are 11.5164 and 0.0950.
Degree of freedom = n -1 = 20-1 = 19
From critical value table, the t-value is 2.093.
The confidence interval is computed as:
The confidence interval is
Chapter 9 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
Introductory Statistics (2nd Edition)
An Introduction to Mathematical Statistics and Its Applications (6th Edition)
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