Happy School System wants to estimate the work involved in completely switching
to paperless grade reports. The school system randomly selected 425 families and
logged the number of paper grade reports sent during the last school year. They
found a 95% confidence interval of (6.2-8.8) for the mean number of grade reports
sent to each family last school year.
Which statement is a valid conclusion based on the information given?
404 out of the 425 families will have received greater than 6.2 grade reports last
year.
There is a 95% chance that the mean number of grade reports sent to each
family last year ranges from 6.2 to 8.8.
There is a 95% chance that the mean number of grade reports sent to each
family last year was greater than 8.8 grade reports.
The Margin of Error for the data is +/-2.6