Shape-Up-By-Susie claims that participating in her exercise program will result in guaranteed weight loss in just 6 weeks. Five clients weighed themselves before and then
Again after participating in her program and the differences "weight after - weight
Before" were analyzed. Based on the relevant computer output shown below, we can say Paired T for After - Before
$\begin{array} { l c r r r } & \mathrm { N } & \text { Mean } & \text { StDev } & \text { SE Mean } \ \text { After } & 5 & 144.6 & 31.7 & 14.2 \ \text { Before } & 5 & 148.0 & 28.9 & 12.9 \ \text { Difference } & 5 & - 3.40 & 3.51 & 1.57 \end{array}$
$95 \%$ upper bound for mean difference: $- 0.06$
$\mathrm { T }$-Test of mean difference $= 0 ( \mathrm { vs }

Question

Shape-Up-By-Susie claims that participating in her exercise program will result in guaranteed weight loss in just 6 weeks. Five clients weighed themselves before and then
Again after participating in her program and the differences "weight after - weight
Before" were analyzed. Based on the relevant computer output shown below, we can say Paired T for After - Before
$\begin{array} { l c r r r } & \mathrm { N } & \text { Mean } & \text { StDev } & \text { SE Mean } \ \text { After } & 5 & 144.6 & 31.7 & 14.2 \ \text { Before } & 5 & 148.0 & 28.9 & 12.9 \ \text { Difference } & 5 & - 3.40 & 3.51 & 1.57 \end{array}$
$95 \%$ upper bound for mean difference: $- 0.06$
$\mathrm { T }$-Test of mean difference $= 0 ( \mathrm { vs } < 0 ) : \mathrm { T }$-Value $= - 2.17 \mathrm { P }$-Value $= 0.048$
A) This is a paired design.
B) This is a two tailed test.
C) This is one tailed test.
D) Both A and B.
E) Both A and C.

Quizplus · Accepted Answer

This is a paired design because the same subjects were weighed before and after the exercise program. 
Since the null hypothesis is that there is no difference between the mean weights before and after the program (i.e. mean difference = 0), and the alternative hypothesis is that the mean weight after the program is less than the mean weight before the program (one-sided), this is a one-tailed test.

Shape-Up-By-Susie Claims That Participating in Her Exercise Program Will Result