1.A researcher gathers four sets of identical twins so that she can explore the effect of a new energy drink on alertness levels. For each pair of twins, she gives one twin a placebo and the other the energy pill; one hour later, she has them completed a reaction time test. The energy pill is expected to produce different reaction times; does it? Perform an appropriate two-tailed test of the significance of the mean difference.

Placebo

Energy Pill

10

8

12

10

12

8

15

10

a.(.5 pt) Hypothesis:

b.(.25 pt)df=

c.(.75 pt) t_crit=

d.(.25 pt) Mean difference =

e.(1 pt) t_obs=

f.(0.5 pt) Experimental conclusion (Write out):

g.(0.5 pt) Find the 95% CI for this data: