3 Using the standard normal distribution answer the folfoiwi

3. Using the standard normal distribution, answer the folfoiwing questións, bales a) Find the z-score zo such that P(Z

Solution

a)

We get the z score from the given left tailed area. As      
      
Left tailed area =    0.7776  
      
Then, using table or technology,      
      
z =    0.764112842   [ANSWER]

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b)

We get the z score from the given left tailed area. As      
      
Left tailed area =    0.05  
      
Then, using table or technology,      
      
z =    -1.644853627    [ANSWER]

(if you use the absolute value in your class, please ignore the negative sign)

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c)

As

alpha = 0.05

then

alpha/2 = 0.025

We get the z score from the given left tailed area. As      
      
Left tailed area =    0.025  
      
Then, using table or technology,      
      
z =    -1.959963985   [ANSWER]

(if you use the absolute value in your class, please ignore the negative sign)