Mapter 9 Jessica Salmeron-Uribe
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Due in 3 hours, 46 minutes. Due Tue 08/11/2020 11:59 pm
A school administrator wants to see if there is a difference in the number of students per class for Portland Public School
district (group 1) compared to the Beaverton School district (group 2). Assume the populations are normally distributed
with unequal variances. A random sample of 25 Portland classes found a mean of 38 students per class with a standard
deviation of 2. A random sample of 27 Beaverton classes found a mean of 35 students per class with a standard
deviation of 4.
1)
1)
Find a 99% confidence interval in the difference of the means. Use technology to find the critical value using df -
38.866 and round answers to 4 decimal places.
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Points possible: 1
This is attempt 1 of 3.
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