J jaffar New Member Nov 10, 2016 #1 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.
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.
math_celebrity Administrator Staff member Nov 10, 2016 #2 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
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