3. Twenty randomly selected managers were found to spend a mean time of 2.4 hours per day on paperwork, according to a time-use study. The standard deviation of the 20 scores was 1.30 hours. Construct a 90% confidence interval for the mean time spent on paperwork by all managers.

x-bar =__________________

s =____________________

n =_____________________

d.f. =_____________________

critical value =__________________

E =________________

confidence interval, least to greatest:___________to____________