Eye Blinks A survey of 49 individuals found that the average number of times a person blinks his or her eyes is 25 times per minute. Based on this survey, find the 90% confidence of the population
To construct: The 90% confidence interval for the populationmean number of eye blinks per minute.
Answer to Problem 7.1.1RE
The 90% confidence interval for the population mean number of eye blinks per minuteis
Explanation of Solution
Given info:
Calculation:
Confidence interval:
Software Procedure:
Step by step procedure to obtain the 90% confidence interval for the mean bill for all cars from the drive-thruusing the MINITAB software:
- Choose Stat > Basic Statistics > 1-Sample Z.
- In Summarized data, enter the sample size as 49 and mean as 25.
- In Standard deviation, enter a value for s as 4.
- 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 population mean number of eye blinks per minuteis
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Chapter 7 Solutions
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