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Textbook Expert
Textbook ExpertVerified Tutor
6 Nov 2021

Given information

Number of lettuce heads selected, n = 20

Mean of the sample, =2.2

The standard deviation of the population, =0.2

 

Step-by-step explanation

Step 1.

Level of significance = 95%

= 0.05  

For calculating 95% confidence intervals,

The critical value of z =  

 

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