The director for Weight Watchers International wants to determine if the changes in their program results (variableA) in better weight loss (variable B). She selected 25 Weight Watch members at random and compared their weight 6 months later to weight at the start of the program. (Data Attached)

(The weight in the column labeled "After" represent their weight six months later and "Before" represents their weight at the start of the six-month period). The director used .05 as the significance level.

Use excel to test. For each paired difference, compute After - Before. In Data Analysis, t-Test: Paired Two Sample for means, select the After data for Variable 1 Range. Note that the critical value output by Data Analysisfor this test is always positive. In this problem, the sign of the critical value is negative corresponding to a 1-tailed with lower reject region and negative lower critical value.

In a one-tail test H0 is rejected if P(T<=t) one tail < significance level

What are the Null and Alternate Hypotheses?

A) H0: After - Before>0; HA: After - Before <=o

B) H0: After - Before => 0; HA: After - Before > 0

C) H0: After - Before =0; HA: After - Before not= 0

D) H0: After - Before =>0; HA: After - Before < 0