Effect of Splitting the Bill- A study compared the cost
of restaurant meals when people pay individually versus splitting
the bill as a group. In the experiment half of the people were told
they they would each be responsible for individual meals costs and
the other half were told the cost would be split equally among the
six people at the table. The 24 people paying individually had a
mean cost of 37.29 Israeli shekels with a standard deviation of
12.54, while the 24 people splitting the bill had a higher mean
cost of 50.92 Israeli shekels with a standard deviation of 14.33.
The raw data can be found in SplitBill and both
distributions are reasonably bell-shaped. Use this information to
find a 95%confidence interval for the difference in mean meal cost
between these two situations. Click here for the dataset associated
with this question: http://www.lock5stat.com/datapage.html. Scroll
down or search "spilt bill" for data. Round your answers to two
decimal places.
The 95% confidence interval is ______, ______
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