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 Salem School district (group 2). A random sample of 27 Portland classes found a mean of 36 students per class with a standard deviation of 4. A random sample of 26 Salem classes found a mean of 38 students per class with a standard deviation of 2. Assume all conditions are met for inference. Round answers to at least one decimal place. Find a 99% confidence interval in the difference of the means.
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 Salem School district (group 2). A random sample of 27 Portland classes found a mean of 36 students per class with a standard deviation of 4. A random sample of 26 Salem classes found a mean of 38 students per class with a standard deviation of 2.
Assume all conditions are met for inference. Round answers to at least one decimal place.
Find a 99% confidence interval in the difference of the means.
(,) round to 1 decimal places
Interpret the confidence interval in context: round all values to 1 decimal place
We are % that the difference in class size between Portland and Salem is between and .
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