a) since the sample represents the population the 95% confidence interval represents as follows
95% of the americans relax or pursue enjoyable activities between 3.53 to 3.83 hours on an average working day.
b) If we consider 90% confidence interval the interval will become shorter because the critical value for 90% confidence is lesser than 95% confidence.
c) Mean = (3.83+3.53)/2 = 3.68 hours
d) Keeping all other things constant only changing the confidence interval
for 95% Confidence margin of Error = 0.15 hours
E =
= 0.0765
99% CI E = 0.0765*2.58 = 0.197
99% CI = (3.68 - 0.197 , 3.68+0.197) = ( 3.483, 3.877)
survey used to collect data on incerview of a randomly-selected sample of aduits. One of the...