Elementary Statistics: A Step By Step Approach
9th Edition
ISBN: 9780073534985
Author: Allan Bluman
Publisher: McGraw-Hill Science/Engineering/Math
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Question
Chapter 7, Problem 7.1.1RE
To determine
To construct: The 90% confidence interval for the true
Expert Solution & Answer
Answer to Problem 7.1.1RE
The 90% confidence interval for the true mean number of isotopes for all elements with isotopes is
Explanation of Solution
Given info:
30 samples of chemical elements were selected Mean is 19.63 and standard deviation is 18.73.
Calculation:
Confidence interval:
Software Procedure:
Step by step procedure to obtain the 90% confidence interval for the mean number of isotopes using the MINITAB software:
- Choose Stat > Basic Statistics > 1-Sample Z.
- In Summarized data, enter the
sample size as 30 and mean as 19.63. - In Standard deviation, enter a value for s as 18.73.
- Check Options, enter Confidence level as 90.0.
- Choose not equal in alternative.
- Click OK in all dialogue boxes.
Output using the MINITAB software is given below:
From the MINITAB output, the 90% confidence interval for the true mean number of isotopes for all elements with isotopes is
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Chapter 7 Solutions
Elementary Statistics: A Step By Step Approach
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