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To determine the average weight of carry-on luggage by passengers in airplanes, a sample of 35...

To determine the average weight of carry-on luggage by passengers in airplanes, a sample of 35 pieces of carry-on luggage was weighed. The average weight was 17 pounds. Assume that we know the standard deviation of the population to be 9 pounds. Determine a 97% confidence interval estimate for the mean weight of the carry-on luggage.

Provide the lower limit of the confidence interval.(Round to four decimal places)

Math   Statistics-And-Probability   
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Answer #1

We have given that,                  
                  
Sample mean =17          
Population standard deviation=9      
Sample size=35          
Level of significance =1-0.97=0.03          
Z critical value (by using Z table)=2.17          
Lower limit formula for confidence interval

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