1. 

   jaffar New Member

   The principal randomly selected six students to take an aptitude test.
   Their scores were: 87.4 86.9 89.9 78.3 75.1 70.6
   Determine a 90% confidence interval for the mean score for all students.

    

   jaffar, Nov 10, 2016

   #1
   
   
2. 

   math_celebrity Administrator Staff Member

   First, determine the mean and standard deviation for the sample
   Mean = 81.3667
   SD = 7.803
   
   Next, use our confidence interval for the mean calculator with these values and n = 6
   74.9478 < u < 87.7856

    

   math_celebrity, Nov 10, 2016

   #2
   
   

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